‖prop. n. pl. [ NL., fr. Gregarina the typical genus, fr. L. gregarius. See Gregarious. ] (Zool.) An order of Protozoa, allied to the Rhizopoda, and parasitic in other animals, as in the earthworm, lobster, etc. When adult, they have a small, wormlike body inclosing a nucleus, but without external organs; in one of the young stages, they are amœbiform; -- called also Gregarinida, and Gregarinaria. [ 1913 Webster ]
a. [ L. gregarius, fr. grex, gregis, herd; cf. Gr. &unr_; to assemble, Skr. jar to approach. Cf. Congregate, Egregious. ] Habitually living or moving in flocks or herds; tending to flock or herd together; not habitually solitary or living alone. Burke. [ 1913 Webster ]
No birds of prey are gregarious. Ray.
-- Gre*ga"ri*ous*ly, adv. -- Gre*ga"ri*ous*ness, n.
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