SPHINCTER

the ring shaped muscle that closes a body opening.

SPHINCTER: "We have sphincter muscles to close openings in our body like the iris."
Cite this page: N., Pam M.S., "SPHINCTER," in PsychologyDictionary.org, April 13, 2013, https://psychologydictionary.org/sphincter/ (accessed December 6, 2019).
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