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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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