gastight

[gas-tahyt]
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adjective

not penetrable by a gas.
not admitting a given gas under a given pressure.

Origin of gastight

First recorded in 1825–35; gas + tight
Related formsgas·tight·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for gastight

gastight

adjective

not allowing gas to enter or escape
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