(slang, sexology) A band, worn around the base of the penis, used to slow down the flow of blood from the penile tissue and hence maintain an erection.

Having to do with ring theory.

Having to do with ring theory.

plural of engagement ring

(firearms) A small metal ring on the side of a firearm, allowing it to be hung on a saddle hook or attached to a lanyard.

plural of O-ring

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 token ring