1. Jacobin a member of the radical movement that instituted the Reign of Terror during the French Revolution
  2. jack pine slender medium-sized two-needled pine of eastern North America; with yellow-green needles and scaly grey to red-brown fissured bark
  3. Jacobean of or relating to James I or his reign or times
  4. Jacobite a supporter of James II after he was overthrown or a supporter of the Stuarts
  5. Jacobinic of or relating to the Jacobins of the French Revolution
  6. Jack Benny United States comedian known for his timeing and delivery and self-effacing humor (1894-1974)
  7. jack bean annual semi-erect bushy plant of tropical South America bearing long pods with white seeds grown especially for forage
  8. Jacobi German mathematician (1804-1851)
  9. acapnia a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing
  10. backbone the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
  11. acarine mite or tick
  12. jawbone the jaw in vertebrates that is hinged to open the mouth
  13. Jacobs United States writer and critic of urban planning
  14. Jacob son of Isaac
  15. Jakobson United States linguist (born in Russia) noted for his description of the universals of phonology (1896-1982)
  16. Jacobinism the ideology of the most radical element of the French Revolution that instituted the Reign of Terror
  17. jack plane a carpenter's plane for rough finishing
  18. jugal bone the arch of bone beneath the eye that forms the prominence of the cheek
  19. Jacquinia sometimes placed in family Myrsinaceae
  20. jackboot (19th century) a man's high tasseled boot

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