promastigote

[ prō-măstĭ-gōt′ ]

n.

The flagellate stage of a trypanosomatid protozoan, as that of any of the Leishmania parasites.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.