noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A circular gasket, usually made of rubber.

   "The O-rings of the Solid Rocket Boosters were not designed to erode."

2. 2
   A small metal ring used to connect two straps.

Example

More examples

"You must replace the damaged o-ring in the faucet."

Etymology

From O + ring.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.