A circular gasket, usually made of rubber.

A contraception device consisting of a flexible ring held in the vagina which provides a controlled release of drugs.

A small plover, Charadrius hiaticula, that has a black neckband

plural of ring finger

An object designed for a baby or toddler to chew during the teething stage

A configuration of wormholes where for each individual wormhole the time difference across its mouths is such that it may not allow a closed timelike curve.

A game in which rings are thrown onto pegs or posts.

(algebra) A ring whose multiplicative operation is idempotent.

A ring for holding napkins along with cutlery.

A ring (piece of jewellery) representing a Christian religious vow to abstain from sexual intercourse until marriage.