Involuntary Muscle - Definition, Meaning & Synonyms

SKIP TO CONTENT involuntary muscle /ɪnˌvɑlənˈtɛri ˌmʌsəl/ IPA guide

Other forms: involuntary muscles

Definitions of involuntary muscle
  1. noun a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart) synonyms: smooth muscle see moresee less types: myometrium the smooth muscle forming the wall of the uterus musculus sphincter ani internus an internal ring of smooth muscle formed by circular fibers of the rectum type of: muscle, musculus one of the contractile organs of the body
Cite this entry Style: MLA
  • MLA
  • APA
  • Chicago
Copy citation DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘involuntary muscle'. Views expressed in the examples do not represent the opinion of Vocabulary.com or its editors. Send us feedback Word Family

Vocabulary lists containing involuntary muscle

view more about the vocabulary list Human Anatomy and Physiology - High School

Got anatomy and physiology on the brain? Then you'll want to bone up on these terms related to the human body. Learn all about the nervous, respiratory, skeletal, and digestive systems. This list is sure to get your blood flowing!

view more about the vocabulary list Human Anatomy and Physiology - Middle School

Got anatomy and physiology on the brain? Then you'll want to bone up on these terms related to the human body. Learn all about the nervous, respiratory, skeletal, and digestive systems. This list is sure to get your blood flowing!

MORE VOCABULARY LISTS 2 million people are mastering new words. Master a word

Sign up now (it’s free!)

Whether you’re a teacher or a learner, Vocabulary.com can put you or your class on the path to systematic vocabulary improvement.

Get started Learn with us
  • Learner subscriptions
  • Vocabulary lists
  • Dictionary
  • Test Prep
  • Join a Vocabulary Jam
  • Commonly confused words
  • Word of the day
Teach with us
  • For educators
  • For schools and districts
  • How it works
  • Success stories
  • Research
  • Professional development
  • Contact sales
Resources
  • Help articles/FAQ
  • Teaching resources
  • Learner resources
  • ESL/ELL resources
  • Grade level resources
  • IPA Pronunciation
  • Contact support
Leaderboards
  • Vocabulary Bowl
  • Today's leaders
  • Weekly leaders
  • Monthly leaders
About
  • Our Mission
  • Blog
  • Tell us what you think
  • Privacy Policy
  • Terms of Use
My Account Log in Sign up
    My Account
  • Log Out
  • My Learning
  • My Proficiency Report
  • My Profile
  • Schools & Teachers
  • My Classes
  • Assignments & Activities
  • My Lists
    • Find a List to Learn...
    • Create a New List...
  • My Progress
    • Words I'm Learning
    • My Trouble Words
    • Words I've Mastered
    • My Achievements
  • User Administration
  • User Authentication
  • My Account
IXL Learning

Comprehensive K-12 personalized learning

Rosetta Stone

Immersive learning for 25 languages

Wyzant

Trusted tutors ready to help in 300+ subjects

Education.com

35,000 worksheets, games, and lesson plans

TPT

Marketplace for millions of educator-created resources

ABCya

Fun educational games for kids

SpanishDictionary.com

Spanish-English dictionary, translator, and learning

Inglés.com

Diccionario inglés-español, traductor y sitio de aprendizaje

Emmersion

Fast and accurate language certification

FrenchDictionary.com

French-English dictionary, translator, and learning

vocabulary.com logo Copyright © 2025 Vocabulary.com, Inc. A division of IXL Learning All Rights Reserved. IXL logo Facebook logo X.com logo Instagram logo LinkedIn logo

Tag » What Is The Involuntary Muscle