Wiktionary
anal sphincter
n. The sphincter (= ring muscle) that surrounds the anus (=anal orifice)
WordNet
anal sphincter
n. the sphincter muscle of the anus [syn: sphincter ani, musculus sphincter ani]
Usage examples of "anal sphincter".
After that initial breakthrough, the anal sphincter gave up and the rest of the incubus's well-oiled organ slammed in to its full length and depth.
He closes his eyes, puckers his anal sphincter, and clenches his teeth.
Hiro can feel his anal sphincter contracting to the size of a pore.
He can make sure Artis doesn't get bail, that he gets the treatment at the jail till his anal sphincter has the same consistency as Cream of Wheat.
I have just read about a teenage father who shook his baby to death because it couldn't control its anal sphincter yet and wouldn't stop crying.