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involuntary muscle is a noun meaning "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)". It carries one recorded sense.
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)
Definitions, synonyms and semantic relations for involuntary muscle come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.