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jealous Fearful of losing someone's affection, or of losing one's preferential position, to someone else. [5 definitions]
jealousy envious or suspicious resentment, as of another's success, good fortune, or good qualities. [4 definitions]
jean (pl.) pants made from a heavy, often blue, twilled cotton cloth. [2 definitions]
Jean Baptiste Lamarck a French naturalist (b.1744--d.1829).
Jean Middleton South African author and anti-apartheid activist.
Jean-Paul Sartre a French philosopher and author (b.1905--d.1980).
jeep a small motor vehicle usu. equipped with four-wheel drive and suited to use in rugged terrain, originally developed for military use and later adapted for civilian use. [2 definitions]
jeepers used to express moderate surprise, emotion, emphasis, or the like.
jeer to remark in a loud, mocking, abusive manner. [3 definitions]
jeez (slang, sometimes offensive) used to express surprise or mild annoyance.
Jefferson City the capital of Missouri.
Jeffrey pine a tall pine tree of the northwestern United States, having long, blue-green needles and elongated cones.
Jehoshaphat according to the Old Testament, a king of Judah who ruled in the ninth century B.C.
Jehovah a name of God derived from ancient Hebrew terms that is used by Christians, esp. in certain English translations of the Old Testament.
Jehovah's Witnesses a Christian sect that opposes war and governments, believes in the imminent end of the world, and actively seeks new converts.
jejune lacking interest or liveliness; dull. [3 definitions]
jejunum the coiled central portion of the small intestine, between the duodenum and the ileum.
Jekyll and Hyde in the nineteenth-century novel The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson, the protagonist, who changes from the benevolent Dr. Jekyll into the evil Mr. Hyde. [2 definitions]
jell to solidify or congeal; become like a gel or jelly. [5 definitions]
jellify to make or turn into jelly.
Jell-O trademark for a sweetened, fruit-flavored gelatin dessert.