Science is a vast field full of complex terms and concepts However, some words stand out for their unique beginnings. However When exploring science-related vocabulary, words starting with the letter “J” offer a fascinating array of subjects across biology, physics, astronomy, and more.
From Jellyfish, a soft-bodied marine creature with tentacles, to Jupiter, the largest planet in our solar system known for its massive storm systems, each word reveals something intriguing about the world around us.
Whether it’s understanding how a Jet achieves propulsion, learning about energy with the unit called the Joule, or discovering the mysteries of the Jurassic Period, this comprehensive list of science words starting with “J” is both educational and exciting. In this article we read 105 Science Word That Start with J.
Grade 5 Science words that start with j
Word | Meaning |
---|---|
Jellyfish | Soft marine animal with tentacles. |
Jupiter | Largest planet in the solar system. |
Jet | Propelled movement through air or water. |
Joule | Unit for measuring energy. |
Jackal | A wild dog from Africa and Asia. |
Jigsaw Puzzle | A puzzle with interlocking pieces. |
Jet Stream | Fast wind current at high altitudes. |
Jaw | Bone structure for chewing. |
Joint | Where two bones meet. |
Javelin | Long object thrown in sports. |
Journal | A publication for research articles. |
Jolt | Sudden shock or movement. |
Jumper | A knitted sweater. |
Jet Engine | Engine used for propulsion in planes. |
Jaguar | Large, powerful cat species. |
Jigsaw | A cutting tool or puzzle. |
Jockey | Horse rider in a race. |
Juvenile | A young animal or person. |
Jam | Sweet fruit spread. |
Jumble | A messy mixture. |
Grade 6 Science words that start with j
Word | Meaning |
---|---|
Jet Propulsion | Movement using jet thrust. |
Joule’s Law | Relates heat and electricity. |
Joule Heating | Heat generated by electric current. |
Jet Lag | Tiredness from long travel across time zones. |
Jurassic Period | Era with many dinosaurs. |
Jovian Planets | Large gas planets like Jupiter. |
Juxtaposition | Placing things next to each other for comparison. |
Jellyfish Sting | Painful reaction from a jellyfish’s tentacle. |
Jawbone | Bone that forms the jaw. |
Joule-Thomson Effect | Cooling of gases when they expand. |
Jatropha | Plant used for making biofuel. |
Jacuzzi Effect | Water swirling similar to a whirlpool. |
Jounce | A quick and sharp movement. |
Joint Inflammation | Swelling in the joints. |
Jumbo Jet | A large passenger aeroplane. |
Jupiter’s Moon | Natural satellite of Jupiter. |
Joule-Thomson Coefficient | Measures how gas changes as it expands. |
Joule’s Experiment | Experiment that shows energy conservation. |
Jet Engine Design | Engineering behind jet engines. |
Jovian Atmosphere | The gases surrounding Jupiter and other gas giants. |
Grade 7 Science words that start with j
Word | Meaning |
---|---|
Junctional Complex | Structures in cells that stick them together. |
Juxtaposed Genes | Genes placed near each other on chromosomes. |
Joint Range of Motion | How far a joint can move. |
Joule per Mole | Energy measurement related to molecules. |
Jute Fiber | Natural fiber from jute plants. |
Jovian Magnetosphere | Magnetic field of Jupiter and gas giants. |
J-shaped Growth Curve | Rapid growth graph shape. |
Jet Fuel | Special fuel for jet engines. |
Joule Expansion | Gases expand as energy is added. |
Jurisdiction | Legal authority or control. |
Jumping Gene | DNA segment that can move within the genome. |
Jacobian Matrix | A tool for solving calculus problems. |
Jurassic Fossil | Fossils from the Jurassic era. |
Jumping Spider | A spider known for jumping. |
Joule-Thomson Inversion | Temperature changes during gas expansion. |
Joule-Kelvin Effect | Cooling effect during gas flow. |
Juxtracrine Signaling | Direct cell communication. |
Jurka Cells | Human cells used in research. |
Jet Stream Patterns | Flow of high-altitude winds. |
Juxtaglomerular Apparatus | Kidney structure that regulates blood pressure. |
Jacobian Determinant | Used in mathematical modeling. |
Joint Disorder | Problems that affect joint function. |
Juxta positional Gene Regulation | Genes influencing each other’s function. |
Jensen’s Inequality | Concept in probability theory. |
Jobber Syndrome | Genetic disorder affecting the brain. |
Junction Potential | Voltage difference at a junction. |
Jitter Analysis | Timing variability in signals. |
Jet Velocity | Speed of fluid jets. |
Java Programming | Programming language for software development. |
Joint Moment | Rotational force around a joint. |
Grade 8 Science words that start with j
Word | Meaning |
---|---|
Joule-Thomson Cooling | Cooling of gases during expansion. |
Jovian Moon | A moon orbiting a gas planet like Jupiter. |
Jacobian Transformation | Math tool for changing coordinates. |
Juxtaposition Analysis | Comparing elements placed side by side. |
Jackdaw | A small intelligent bird from Eurasia. |
Jet Lag Syndrome | Sleep disorder from travelling across time zones. |
Jaccard Index | Measures the similarity between data sets. |
Jensen-Shannon Divergence | Method for measuring differences in distributions. |
Joint Torque | Rotational force at a joint. |
Jovian Aurora | A natural light display on gas giants. |
Jatropha Biodiesel | Renewable biofuel from Jatropha plant seeds. |
Judd-Ofelt Theory | Explains how ions behave in materials. |
Jet Impingement | Cooling process using fluid jets. |
Jacobi Iteration | A method for solving equations step |
Grade 9 Science words that start with j
Word | Meaning |
---|---|
Junction Transistor | A type of electronic component. |
Jigsaw Learning | A method for group learning in education. |
Juvenile Hormone | A hormone regulating growth in insects. |
Joule-Thomson Coefficient | A coefficient related to gas expansion. |
Joule Expansion Coefficient | Describes how gases expand when energy is added. |
Jurkat Cells | A cell line used for studying T-cells in the immune system. |
Jet-Induced Cavitation | The creation of bubbles in a liquid from a jet. |
Jumping Universe Theory | A cosmological theory about how the universe might evolve. |
Junction Box | A container for electric wires. |
Jet Nozzle | A nozzle that controls the direction of a fluid jet. |
Juvenile Stage | The stage before adulthood in animals. |
Joint Capsule | The sac enclosing a joint. |
Jacobian Ellipsoid | A mathematical description of rotating bodies. |
Jet Deflector | A device to control the direction of a jet stream. |
Juvenile Growth Hormone | A hormone involved in animal development. |
Jovian System | The collection of moons and rings around Jupiter. |
Jet Pack | A device worn on the back for personal flight. |
Joint Fluid | The fluid found inside a joint for lubrication. |
Juno Mission | A NASA space mission to study Jupiter. |
Joule per Second | A unit measuring power (equivalent to watts). |
Jupiter’s Magnetosphere | The large magnetic field around Jupiter. |
Jet Stream Energy | The power generated by high-altitude winds. |
J-shaped Protein | A specific structure in biochemistry. |
Jovian Heat Distribution | The way heat is spread across Jupiter. |
Jet Mixing | The combination of liquids through a jet. |
Physical Science Words That Start with J
Word | Meaning |
---|---|
Joule | Unit of energy. |
Jet Propulsion | Movement using expelled gas. |
Jerk | Change in acceleration rate. |
Junction | Where two materials meet. |
Jovian Planets | Gas giants like Jupiter. |
Jet Stream | Fast atmospheric winds. |
Joule Heating | Heat from electric current. |
Joule-Thomson Effect | Cooling in expanding gases. |
Jettison | Discarding material from a moving object. |
Joule per Second | Another name for watt (power). |
Jet Engine | Engine that expels gas for thrust. |
Jacobian Matrix | Mathematical tool for systems of equations. |
Jovian Magnetosphere | Jupiter’s magnetic field. |
Joule Expansion | Increase in gas volume when energy is added. |
Jovian Atmosphere | Atmosphere of gas giants like Jupiter. |
Jet Velocity | Speed of expelled gas or fluid. |
Junction Transistor | Semiconductor for amplifying signals. |
Jacobian Determinant | Used in physics for transformations. |
Joule-Thomson Coefficient | Factor for gas temperature change. |
Jet Deflector | Device that redirects jets of gases. |
Biology Words That Start with J
Word | Meaning |
---|---|
Juvenile | Young or immature organism. |
Jellyfish | Marine animal with tentacles. |
Joint | Connection point of two bones. |
Juxtaposition | Side-by-side comparison. |
Juxtacrine Signaling | Cell communication between adjacent cells. |
Jacobin Pigeon | A type of domestic pigeon. |
Jungle | Dense forest habitat. |
Jawbone | Bone forming the jaw. |
Jaundice | Yellow skin due to liver issues. |
Junctional Complex | Structures for cell adhesion. |
Juxtamedullary Nephron | Kidney part for blood filtration. |
J-Protein | Assists in protein folding. |
Jelly Layer | Protective layer in amphibian eggs. |
Juxtaglomerular Apparatus | Kidney structure regulating blood pressure. |
Juvenile Hormone | Insect hormone controlling development. |
Jugular Vein | Vein carrying blood from head to heart. |
Jurkat Cells | T-cells used in research. |
Jumping Gene | DNA that moves within the genome. |
Jacobson’s Organ | Sensory organ in reptiles. |
Jellyfish Sting | Painful reaction from jellyfish tentacle. |
Chemistry Words That Start with J
Word | Meaning |
---|---|
Joule | Unit of energy. |
Joule-Thomson Effect | Cooling of gas during expansion. |
Jaboncillo | Soap made from natural oils. |
Junction Potential | Voltage at the interface of two materials. |
Joule Heating | Heat generated by electric current. |
Jatropha Oil | Biofuel from Jatropha seeds. |
Joule-Thomson Coefficient | Measures temperature change in gases during expansion. |
Jasmine Oil | Essential oil used in perfumes. |
Jet Fuel | Fuel for jet engines. |
Juxtaposition | Side-by-side comparison in chemistry. |
Jablonski Diagram | Diagram showing molecular energy states. |
Jute Fiber | Natural fiber from the jute plant. |
Junction Diode | Semiconductor used for controlling electric current. |
Jones Reagent | Solution for oxidizing alcohols. |
Jelly | A colloid mixture. |
Jet Stream Chemistry | Study of high-altitude winds and their chemical interactions. |
Juxtaposition of Ions | Comparison of ions placed together. |
Junk DNA | Non-coding DNA. |
Jigsaw Molecules | Molecules that fit together in reactions. |
Quiz Time!
- Which planet is the largest in the solar system?
- A) Earth
- B) Mars
- C) Jupiter
- What is jet propulsion?
- A) Movement using wind
- B) Movement using jet or rocket thrust
- C) Movement using water currents
- Which era is known for dinosaurs?
- A) Jurassic
- B) Triassic
- C) Cretaceous
Answers: 1-C, 2-B,
Grade 5 Science Vocabulary Quiz Questions:
- What is the soft marine animal with tentacles called?
- A) Jaguar
- B) Jellyfish
- C) Jet Stream
- Which planet is the largest in the solar system?
- A) Jupiter
- B) Jet Engine
- C) Javelin
- What unit is used to measure energy?
- A) Joule
- B) Joint
- C) Journal
Answers for Grade 5:
- B) Jellyfish
- A) Jupiter
- A) Joule
Grade 6 Science Vocabulary Quiz Questions:
- What is the movement using jet thrust called?
- A) Jet Lag
- B) Jet Propulsion
- C) Jet Stream
- What is the law that relates heat and electricity?
- A) Joule’s Law
- B) Javelin Theory
- C) Jet Propulsion
- What era had many dinosaurs?
- A) Jet Lag Period
- B) Jurassic Period
- C) Jatropha Period
Answers for Grade 6:
- B) Jet Propulsion
- A) Joule’s Law
- B) Jurassic Period
Grade 7 Science Vocabulary Quiz Questions:
- What are genes placed near each other on chromosomes called?
- A) Junction Genes
- B) Juxtaposed Genes
- C) Jet Genes
- What measures energy related to molecules?
- A) Joule per Mole
- B) Jet Mole
- C) Joule Expansion
- What natural fiber is derived from plants?
- A) Jute Fiber
- B) Javelin Fiber
- C) Jet Fiber
Answers for Grade 7:
- B) Juxtaposed Genes
- A) Joule per Mole
- A) Jute Fiber
Grade 8 Science Vocabulary Quiz Questions:
- What is the cooling of gases during expansion called?
- A) Joule-Thomson Cooling
- B) Jet-Thrust Cooling
- C) Jolt Cooling
- What small bird is known for intelligence?
- A) Jaguar
- B) Jackdaw
- C) Jetbird
- What is the method for measuring similarity between data sets?
- A) Jensen-Shannon Divergence
- B) Jaccard Index
- C) Javelin Index
Answers for Grade 8:
- A) Joule-Thomson Cooling
- B) Jackdaw
- B) Jaccard Index
Grade 9 Science Vocabulary Quiz Questions:
- What hormone regulates growth in insects?
- A) Juvenile Hormone
- B) Joint Hormone
- C) Jet Hormone
- What is a type of electronic component called?
- A) Jet Transistor
- B) Junction Transistor
- C) Joule Transistor
- What is the name of the NASA space mission to study Jupiter?
- A) Jovian Mission
- B) Javelin Mission
- C) Juno Mission
Answers for Grade 9:
- A) Juvenile Hormone
- B) Junction Transistor
- C) Juno Mission
- Unordered lists, and:
- One
- Two
- Three
- More
Conclusion:
In science, words starting with J span across multiple disciplines, highlighting the diversity and complexity of fields like physical science, biology, and chemistry. From the measurement of energy in joules to biological terms like juvenile or the jet propulsion in engineering, these terms shape the foundational knowledge that drives innovation and discovery.
Whether you’re studying the Joule-Thomson effect in chemistry or examining the jellyfish in biology, understanding these terms helps in grasping the broader scientific concepts that explain our world. By breaking down complex ideas into simple meanings, it becomes easier to connect different aspects of science and see the relationships between them.
Ava Rose, the creator of PhrasesPulse, is an expert in English grammar with years of experience. She is dedicated to simplifying complex grammar rules and exploring the richness of English phrases. Through her insightful posts, Ava aims to help learners of all levels enhance their understanding of the language and communicate more effectively. Her passion is making grammar approachable and enjoyable for everyone.