O-ring

[oh-ring]

noun

1. a ring of pliable material, as rubber or neoprene, used as a gasket: the failure of an O-ring caused the explosion that destroyed the space shuttle Challenger in 1986.

O-ring

noun

1. a rubber ring used in machinery as a seal against oil, air, etc

Word History and Origins

Origin of O-ring¹

First recorded in 1945–50