involuntary muscle

noun
|Updated on: 3 Jul 2018

Definition of involuntary muscle

: muscle governing reflex functions and not under direct voluntary control; especially : smooth muscle

Recent Examples of involuntary muscle from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'involuntary muscle.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of involuntary muscle

1840

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Medical Dictionary

involuntary muscle

noun

medical Definition of involuntary muscle

: muscle governing reflex functions and not under direct voluntary control; especially : smooth muscle

Learn More about involuntary muscle


Seen and Heard

What made you want to look up involuntary muscle? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

having an air of easy unconcern

Get Word of the Day daily email!

Test Your Vocabulary

The Eponym Quiz

  • rubens-painting
  • Which is the best synonym of bowdlerize?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!