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Meaning of O-ring

O-ring

Pronunciation: (ō'ring"), [key]
— n.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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