gas·tight

[gas-tahyt]
adjective
1.
not penetrable by a gas.
2.
not admitting a given gas under a given pressure.

Origin:
1825–35; gas + tight

gas·tight·ness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
gastight (ˈɡæsˌtaɪt) [Click for IPA pronunciation guide]
 
adj
not allowing gas to enter or escape

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Gastight is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Example sentences
All joints and connections shall be made gastight and watertight.
The structure or portion to be fumigated must be transformed into a gastight
  fumigation enclosure.
After installation all field erected piping shall be tested and proved gastight
  at maximum operating pressure.
Indirect-recirculating ovens are ovens which are equipped with a gastight duct
  system, a furnace, and a circulating fan.
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