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cri·thid·ia | \ krə-ˈthid-ē-ə 
\
\Medical Definition of crithidia
1 capitalized : a genus of flagellates of the family Trypanosomatidae that are exclusively parasites of invertebrates especially in the digestive tract of insects and that occur typically as elongated forms morphologically like trypanosomes but pass through developmental stages all in a single host in which they are indistinguishable from typical leptomonas and leishmanias
2a : any flagellate of the genus Crithidia
b : any flagellate of the family Trypanosomatidae when exhibiting a typical form of a crithidia
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