WordReference Random House Unabridged Dictionary of American English © 2020
greg•a•rine  (gregə rīn′, -ər in),USA pronunciation n. 
  1. Microbiologya type of sporozoan parasite that inhabits the digestive and other cavities of various invertebrates and produces cysts filled with spores.

adj. 
  1. Microbiologyhaving the characteristics of or pertaining to a gregarine or gregarines.
  • Neo-Latin Gregarina name of type, equivalent. to Latin gregār(ius) (see gregarious) + -īna -ine1
  • 1865–70

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