[ fahy-bruhl, fib-ruhl ]
See synonyms for fibril on
  1. a small or fine fiber or filament.

  2. Botany. any of the delicate hairs on the young roots of some plants.

  1. Cell Biology. any threadlike structure or filament.

Origin of fibril

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

Other words from fibril

  • fi·bril·lar, adjective
  • fi·bril·lose, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fibril in a sentence

British Dictionary definitions for fibril


fibrilla (faɪˈbrɪlə, fɪ-)

/ (ˈfaɪbrɪl) /

nounplural -brils or -brillae (-ˈbrɪliː)
  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

Origin of fibril

C17: from New Latin fibrilla a little fibre

Derived forms of fibril

  • fibrilar, fibrillar or fibrillose, adjective
  • fibrilliform, adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for fibril


[ brəl, fĭbrəl ]

  1. 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.