Medical Dictionary


noun sphinc·ter \ˈsfiŋ(k)-tər\

Medical Definition of SPHINCTER

:  an annular muscle surrounding and able to contract or close a bodily opening—see anal sphincter, cardiac sphincter, precapillary sphincter, pyloric sphincter
sphinc·ter·al \-t(ə-)rəl\ adjective
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears