A small granule or particle within the endoplasm of a cell, particularly in protozoans.
From Greek endo- 'within' + plastule (diminutive of plastos 'formed'). This specialized term emerged from 19th-century microscopy of single-celled organisms.
Endoplastule is a wonderfully specific word for something scientists could see but couldn't quite identify—under early microscopes, the endoplasm appeared grainy, so they named each speck, before realizing most were just structural artifacts.
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