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nonpareil
nonpartisan
nonpenetrative
nonperforming asset
nonperson
nonplaying
nonplus
nonplussed
nonpoint source
nonprice competition
nonprofit
nonprofitmaking
nonproliferation
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nonrecombinant
nonrecourse debt
nonrecurring charge
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nonreturn valve
non·re·turn valve [ nòn ri túrn vàlv ] (plural non·re·turn valves)


noun 
Definition:
 
engineering 
Same as  check valve
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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