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c.1400, from Late Latin pessarium, from Greek pessarion "medicated tampon of wool or lint," diminutive of pessos "pessary," earlier "oval stone used in games," perhaps of Semitic origin.
pessary pes·sa·ry (pěs'ə-rē)
Any of various devices worn in the vagina to support or correct the position of the uterus or rectum.
A contraceptive diaphragm.
A medicated vaginal suppository.