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Meaning of microfilament

mi•cro•fil•a•ment

Pronunciation: (mī"kru-fil'u-munt), [key]
— n. Cell Biol.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.