fibrilla

noun

fi·bril·la fī-ˈbril-ə

fi-; ˈfī-bri-lə

ˈfib-ri-lə

plural fibrillae -ˌlē

: fibril

Browse Nearby Words

fibril

fibrilla

fibrillar

See all Nearby Words

Cite this Entry

Style

“Fibrilla.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/fibrilla. Accessed 1 Jan. 2026.

Copy Citation

More from Merriam-Webster

Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.

Can you solve 4 words at once?

Can you solve 4 words at once?

Word of the Day

amortize

Listen to the pronunciation of amortize

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

'Buck Naked' or 'Butt Naked'?

'Affect' vs. 'Effect'

The Difference Between 'i.e.' and 'e.g.'

What’s the difference between ‘cemetery’ and ‘graveyard’?

Democracy or Republic: What's the difference?

Popular in Wordplay

Ten Kinds of Happiness

Words That Turned 100 in 2025

The Words of the Week - Dec. 26

17 Words for Dog Breeds

Birds Say the Darndest Things

Popular

'Buck Naked' or 'Butt Naked'?

Ten Kinds of Happiness

Words That Turned 100 in 2025