Definition of fibril
: a small filament or fiber: such as
a
: root hair
b(1)
: one of the fine threads into which a striated muscle fiber can be longitudinally split
(2)
: neurofibril
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Who Knew?
-
- What is a ruelle?

Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
Share fibril
Time Traveler for fibril
The first known use of fibril was in 1664
See more words from the same year