nonreturn

British

/ ˌnɒnrɪˈtɜːn /

adjective

denoting a mechanism that permits flow in a pipe, tunnel, etc, in one direction only

a nonreturn valve

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Unlike Apollo's nonreturn booster and lunar module, the vehicles that take men to Mars will be used on many voyages.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023