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/oh"ring'/, n.
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.
[1945-50]
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O-ring /ōˈring/
noun
A toroidal ring, usu of circular cross-section, used eg as an air or oil seal
ORIGIN: From its shape
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n. a gasket in the form of a ring with a circular cross section, typically made of pliable material, used to seal connections in pipes, tubes, etc
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O-ringsee O 6.
Useful english dictionary. 2012.