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Any of various apicomplexan protozoans that are parasitic within the digestive tract and body cavity of invertebrates, including many insects and mollusks.
[From New Latin Gregārīna, type genus, from Latin gregārius, belonging to a flock; see gregarious.]
greg′a·rine′, greg′a·rin′i·an (-rĭn′ē-ən) adj.
(Animals) any parasitic protozoan of the order Gregarinida, typically occurring in the digestive tract and body cavity of other invertebrates: phylum Apicomplexa (sporozoans)
(Animals) of, relating to, or belonging to the Gregarinida
[C19: from New Latin Gregarīna genus name, from Latin gregārius; see gregarious]