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O & M
O.M.
O.N.
o.n.o.
o’nyong-nyong fever
o.o.
O.O.D.
O’Odham
O-ring
O.S.
o.s.
o/s
o.t.
O2 sup
OA
oaf
oafish
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O-ring
O-ring (plural O-rings)


noun 
Definition:
 
seal: a plastic or rubber ring used in machinery as a seal against air, oil, or high pressure
[Mid-20th century. < its shape]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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