grapefruit n.

mid-13c., "a grape, a berry of the vine," also collective singular, from Old French grape "bunch of grapes, grape" (12c.), probably a back-formation from graper "steal; grasp; catch with a hook; pick (grapes)," from a Frankish or other Germanic word, from Proto-Germanic *krappon "hook," from a group of Germanic words meaning "bent, crooked, hooked" (cognates: Middle Dutch crappe, Old High German krapfo "hook;" also see cramp (n.2)). The original notion thus perhaps was "vine hook for grape-picking." The vine is not native to England. The word replaced Old English winberige "wine berry." Spanish grapa, Italian grappa also are from Germanic.

late 12c., "any vegetable product useful to humans or animals," from Old French fruit "fruit, fruit eaten as dessert; harvest; virtuous action" (12c.), from Latin fructus "an enjoyment, delight, satisfaction; proceeds, produce, fruit, crops," from frug-, stem of frui "to use, enjoy," from suffixed form of PIE root *bhrug- "to enjoy," with derivatives referring to agricultural products. The Latin word also is the source of Spanish fruto, Italian frutto, German Frucht, Swedish frukt-.

Originally in English meaning all products of the soil (vegetables, nuts, grain, acorns); modern narrower sense is from early 13c. Also "income from agricultural produce, revenue or profits from the soil" (mid-14c.), hence, "profit," the classical sense preserved in fruits of (one's) labor.

Meaning "offspring, progeny, child" is from mid-13c.; that of "any consequence, outcome, or result" is from late 14c. Meaning "odd person, eccentric" is from 1910; that of "male homosexual" is from 1935, underworld slang. The term also is noted in 1931 as tramp slang for "a girl or woman willing to oblige," probably from the fact of being "easy picking." Fruit salad is attested from 1861; fruit-cocktail from 1900; fruit-bat by 1869.