microfilament

mi·cro·fil·a·ment

noun \ˌmī-krō-ˈfil-ə-mənt\

Definition of MICROFILAMENT

: any of the minute actin-containing protein filaments that are widely distributed in the cytoplasm of eukaryotic cells, help maintain their structural framework, and play a role in the movement of cell components

—mi·cro·fil·a·men·tous \-ˌfil-ə-ˈment-əs\ adjective