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The Collaborative International Dictionary
Laxator

Laxator \Lax*a"tor\, n. [NL., fr. L. laxare, laxatum, to loosen.] (Anat.) That which loosens; -- esp., a muscle which by its contraction loosens some part.

Wiktionary
laxator

n. (context anatomy English) A muscle whose contraction loosens some part.