/pes"euh ree/ , n. , pl. pessaries . Med.
1. a device worn in the vagina to support a displaced uterus.
2. a vaginal suppository.
3. diaphragm (def. 4).
[ 1350-1400; ME pessarie pessarium a suppository, equiv. to L pess ( um ), pess ( us ) ( pessós oval stone used in a game) + -arium -ARY ]