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From The Collaborative International Dictionary of English v.0.48:
Gregarinae \Greg`a*ri"n[ae]\, 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 am[oe]biform; -- called also Gregarinida, and Gregarinaria. [1913 Webster]