[mahy-uh-fahy-bruhl, -fib-ruhl]
noun Cell Biology.
a contractile fibril of skeletal muscle, composed mainly of actin and myosin.

1895–1900; myo- + fibril Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

myofibril my·o·fi·bril (mī'ə-fī'brəl, -fĭb'rəl)
One of the threadlike longitudinal fibrils occurring in a skeletal or cardiac muscle fiber. Also called sarcostyle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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