smooth muscle

noun Anatomy.
involuntary muscle tissue in the walls of viscera and blood vessels, consisting of nonstriated, spindle-shaped cells.

Origin:
1885–90

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
smooth muscle
 
n
Compare striped muscle muscle that is capable of slow rhythmic involuntary contractions: occurs in the walls of the blood vessels, alimentary canal, etc
 
[so called because there is no cross-banding on the muscle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

smooth muscle n.
Muscle tissue that contracts without voluntary control, having fine myofibrils but lacking transverse striations and found in the walls of internal organs, blood vessels, and hair follicles.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

smooth muscle

muscle that shows no cross stripes under microscopic magnification. It consists of narrow spindle-shaped cells with a single, centrally located nucleus. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically. It constitutes much of the musculature of internal organs and the digestive system.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It consists of three sets of smooth muscle fibers: longitudinal, circular and oblique.
Bundles of smooth muscle fibers allow animals to puff up their fur for insulation or to intimidate others.
The smooth muscle in our intestinal walls has but one mission in life: to propel dinner farther down the digestive pipe.
Image for smooth muscle
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