promastigote
/prəʊˈmastɪɡəʊt/Zoology and Medicine
noun
A flagellated or leptomonad stage in the life cycle of some parasitic protozoans of the family Trypanosomidae; a trypanosome of this stage.
Origin
1960s. Irregularly from pro- + ancient Greek μαστιγ-, μάστιξ whip + -ote.