intrafusal

adjective

in·tra·fu·sal -ˈfyü-zəl

: situated within a muscle spindle

intrafusal muscle fibers

compare extrafusal

Cite this Entry

Style

“Intrafusal.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/intrafusal. Accessed 4 Nov. 2025.

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

spontaneous

Listen to the pronunciation of spontaneous

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

Using Bullet Points ( • )

More Commonly Mispronounced Words

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

13 Wonderful Words That You're Not Using (Yet)

Ten More Words from Taylor Swift Songs

Birds Say the Darndest Things

Even More Bird Names that Sound Like Insults (and Sometimes Are)

Better Ways to Say 'This Sucks'

Popular

Using Bullet Points ( • )

13 Wonderful Words That You're Not Using (Yet)

Ten More Words from Taylor Swift Songs