1785, in reference to a type of flower cluster, from Latin racemus "a cluster of grapes" (see raisin). In Middle English, "a raisin or currant" (late 14c.).
Entries linking to raceme
raisin n.
"dried sweet grape," c. 1300, from Anglo-French raycin (late 13c.), Old French raisin "grape; raisin," from Vulgar Latin *racimus, alteration of Latin racemus "cluster of grapes or berries" (also source of Spanish racimo, Italian racemo), probably a loan-word from the same ancient lost Mediterranean language that gave Greek rhax (genitive rhagos) "grape, berry." In Middle English the word also could be used of grapes themselves. Dutch razun also is from French; German Rosine is from an Old French variant form.