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plural sphincters
(anatomy) A ringlike band of muscle that surrounds a bodily opening (such as the anus or the openings of the stomach), constricting and relaxing as required for normal physiological functioning. quotations examples
She decided that she would force him to climax first by the sheer strength of her young animal control, the strength of her sphincters […]
1982, Lawrence Durrell, Constance (The Avignon Quintet), Faber & Faber, page 836