Definition of smooth muscle
: muscle tissue that lacks cross striations, is made up of elongated spindle-shaped cells having a central nucleus, and is found especially in vertebrate hollow organs and structures (such as the digestive tract and bladder) as thin sheets performing functions not subject to direct voluntary control and in all or most of the musculature of invertebrates other than arthropods — compare striated muscle
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Merriam-Webster unabridged
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Time Traveler for smooth muscle
The first known use of smooth muscle was circa 1890
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