raptor n.

1630s, "moving or doing quickly, capable of great speed," from French rapide (17c.) and directly from Latin rapidus "hasty, swift; snatching; fierce, impetuous," from rapere "hurry away, carry off, seize, plunder," from PIE root *rep- "to snatch" (source also of Greek ereptomai "devour," harpazein "snatch away," Lithuanian raplės "tongs").

Meaning "happening in a short time, coming quickly into existence" is from 1780. Related: Rapidly; rapidness. Rapid-fire (adj.) 1890 in reference to guns, figurative or transferred use by 1900; the noun phrase is by 1836. Rapid-transit first attested 1852, in reference to street railways; rapid eye movement, associated with a certain phase of sleep, is from 1906.

"predatory, preying upon animals," 1825, from raptor + -ial. Alternative raptatorial "predacious" (1840) is from Latin raptatus, past participle of raptare. OED says raptatory is "recent" and Century Dictionary marks raptorious (1819, of insects) as "rare."

1924, from Latin velox (genitive velocis) "swift, speedy" (see velocity) + raptor "robber" (see raptor). Fossil remains discovered in 1923 in the red Djadochta sandstone at Shabarakh Usu in Mongolia.

The first (Fig. 1) of the typical megalosaurian type, although of small size, seems to have been an alert, swift-moving carnivorous dinosaur to which the generic name Velociraptor is applied. [Henry Fairfield Osborn, "Three New Therapoda, Protoceratops Zone, Central Mongolia," in American Museum Novitates, Nov. 7, 1924]