Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Muscle tissue that contracts without conscious control, having the form of thin layers or sheets made up of spindle-shaped, unstriated cells with single nuclei and found in the walls of the internal organs, such as the stomach, intestine, bladder, and blood vessels, excluding the heart.
Wiktionary
- n. anatomy Involuntary muscle which is found within the intestines, throat, uterus, and blood vessel walls.
WordNet 3.0
- n. muscle tissue that does not appear striated under the microscope; has the form of thin layers or sheets
- n. 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)
Examples
“This is called the lower esophageal sphincter, which is a thick ring of circular smooth muscle at the point between the esophagus and the stomach.”
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