[fahy-bruhl, fib-ruhl]
a small or fine fiber or filament.
Botany. any of the delicate hairs on the young roots of some plants.
Cell Biology. any threadlike structure or filament.

1655–65; < Neo-Latin fibrilla, equivalent to Latin fibr(a) fiber + -illa diminutive suffix

fibrillar, adjective
fibrillose, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fibril or fibrilla (ˈfaɪbrɪl, faɪˈbrɪlə, fɪ-)
n , pl -brils, -brillae
1.  a small fibre or part of a fibre
2.  biology a threadlike structure, such as a root hair or a thread of muscle tissue
[C17: from New Latin fibrilla a little fibre]
fibrilla or fibrilla (ˈfaɪbrɪl, faɪˈbrɪlə, fɪ-, -ˈbrɪliː)
[C17: from New Latin fibrilla a little fibre]
'fibrilar or fibrilla
fi'brillar or fibrilla
fi'brillose or fibrilla
fi'brilliform or fibrilla

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

fibril fi·bril (fī'brəl, fĭb'rəl) or fi·bril·la (fī-brĭl'ə)
A minute fiber.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fibril   (fī'brəl, fĭb'rəl)  Pronunciation Key 
Any of various threadlike fibers or filaments that are constituent parts of a cell or larger structure. Cellulose fibrils are the main component of cell walls in plants. Fibrils make up the contractile part of striated muscle fiber in the body.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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