pessary
/ˈpesərɪ/noun
(pl. -ies)
1- a small soluble block that is inserted into the vagina to treat infection or as a contraceptive（治疗炎症或避孕用的）阴道栓剂, 子宫托, 子宫帽。
1.1
- an elastic or rigid device that is inserted into the vagina to support the uterus（支托用）子宫托。
词源
late Middle English: from late Latin pessarium, based on Greek pessos 'oval stone' (used in board games).