[mahy-kroh-fahy-bruhl, -fib-ruhl]
noun Cell Biology.
a microtubule, microfilament, or other fine threadlike structure of a cell.

1935–40; micro- + fibril

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American Heritage
Medical Dictionary

microfibril mi·cro·fi·bril (mī'krō-fī'brəl, -fĭb'rəl)
An extremely small fibril.

The American Heritage® Stedman's Medical Dictionary
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