Medical Definition of leptomonas
1 capitalized : a genus of flagellate protozoans of the family Trypanosomatidae that are parasites especially of the digestive tract of insects and that occur as elongated flagellates with a single anterior flagellum and no undulating membrane
2 plural leptomonas
a : any flagellate protozoan of the genus Leptomonas
b : promastigote
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