O-ring

O-ring

[oh-ring]
noun
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.

Origin:
1945–50

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World English Dictionary
O-ring
 
n
a rubber ring used in machinery as a seal against oil, air, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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