sphincter sphexide • sphincteral · · · Info · Definitions · Synonyms · Characters · · sphincter · · Text Latin · · Script 9 · · Length 2 · · Syllables Definitions · · · (noun) a ring of muscle that contracts to close an opening. Synonyms: anatomical sphincter, sphincter muscle. · · Noun Definition 1 Synonyms · · · anatomical sphincter · · Synonym 1 sphincter muscle · · Synonym 2 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074