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sphincter (n.)

1570s, from French sphincter, from Late Latin sphincter "contractile muscle," from Greek sphinkter "band, lace, anything that binds tight," from sphingein "to squeeze, bind," of unknown origin. First used in anatomical sense by Galen. There are several in the body; the one usually meant is the sphincter ani.

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Definitions of sphincter from WordNet

sphincter (n.)
a ring of muscle that contracts to close an opening;
Synonyms: anatomical sphincter / sphincter muscle
From wordnet.princeton.edu