See also: öring and oring

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Etymology edit

O +‎ ring

Noun edit

O-ring (plural O-rings)

  1. A circular gasket, usually made of rubber.
    • 1986 June 6, Richard Feynman, “Personal observations on the reliability of the Shuttle”, in Presidential Commission on the Space Shuttle Challenger Accident, Report to the President:
      The O-rings of the Solid Rocket Boosters were not designed to erode.

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