[ mahy-kruh-fil-uh-muh nt ]
/ ˌmaɪ krəˈfɪl ə mənt /

noun Cell Biology.

a minute, narrow tubelike cell structure composed of a protein similar to actin, occurring singly and in bundles, involved in cytoplasmic movement and changes in cell shape.

Origin of microfilament

First recorded in 1960–65; micro- + filament

OTHER WORDS FROM microfilament

mi·cro·fil·a·men·tous [mahy-kroh-fil-uh-men-tuh s] /ˌmaɪ kroʊˌfɪl əˈmɛn təs/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for microfilament

/ (ˌmaɪkrəʊˈfɪləmənt) /


thin filament, composed of the protein actin and associated proteins, that occurs abundantly in muscle and in the cytoplasm of other cells
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for microfilament

[ mī′krō-fĭlə-mənt ]


Any of the minute fibers located throughout the cytoplasm of cells, composed of actin and functioning primarily in maintaining the structural integrity of a cell.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.