Science Words That Start With J: Definitions and Examples

Discover a variety of science words that start with the letter ‘J’ to expand your vocabulary and deepen your understanding of scientific concepts.

  1. Joule- A unit of energy in the International System of Units.
  2. Jurassic- Pertaining to the period of the Mesozoic era, characterized by the dominance of dinosaurs.
  3. Jupiter- The largest planet in our solar system, known for its size and a prominent system of rings.
  4. Jejunum- The part of the small intestine between the duodenum and ileum.
  5. Juxtaposition- Placing two elements close together for comparative or contrasting effect.
  6. Jacobian- A matrix of all first-order partial derivatives of a vector-valued function.
  7. Jansky- A unit of spectral flux density used in radio astronomy.
  8. Jet Stream- Strong, narrow air currents found in the atmospheres of some planets, including Earth.
  9. Jovian- Relating to the planet Jupiter or resembling Jupiter.
  10. Joule’s Law- A physical law expressing the relationship between the heat produced by the flow of electric current through a conductor.
  11. Junction- A point where two things are joined, also used in terms of neurons or technology.
  12. Jolt- A sudden movement or surge of electricity.
  13. Jurassic Extinction Event- A major geologic event marking the end of the Jurassic period.
  14. Jadeite- A mineral, typically green, used both in geological and gemological contexts.
  15. Jökulhlaup- A glacial outburst flood caused by the melting of ice or dam failure.
  16. Jangly- Describing a sound or mechanical process that is typically discordant or metallic.
  17. Jigger- A scientific instrument, often used in chemistry for measurement.
  18. Job’s Tears- A type of grass known scientifically as *Coix lacryma-jobi*, also studied in plant science.
  19. Joule- Thomson Effect** – A temperature change in a real gas when it is forced through a valve while kept insulated so that no heat is exchanged with the environment.
  20. Johnston’s Organ- A sensory structure located in the second antennal segment of certain insects.
  21. Jorullo- A volcanic structure, named after the Par√≠cutin’s predecessor, the Jorullo volcano in Mexico.
  22. Junco- A genus of small grayish American sparrows, often subjects of ornithological studies.
  23. Juxtapapillary- Located adjacent to the papilla, especially in medical or optical contexts.
  24. Jadeitite- A rock composed almost entirely of jadeite, found in metamorphic rocks.

This list encompasses a range of scientific words starting with the letter J, from physics and astronomy to biology and geology.

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