n 1  cap  :  a genus of flagellate protozoans of the family Trypanosomatidae that are parasites esp. of the digestive tract of insects and that occur as elongated flagellates with a single anterior flagellum and no undulating membrane  2  pl  leptomonas  a  :  any flagellate protozoan of the genus Leptomonas  b  :  PROMASTIGOTE .
 
 
 
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