myofibrils

myofibril

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

Origin:
1895–1900; myo- + fibril

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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
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