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From: Webster's Revised Unabridged Dictionary (1913)

 Greg·a·ri·næ prop. n. pl.  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.