Definition of "gastight" [gas•tight]

• Impermeable by gas. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The most important prerequisites. for airtight storage are gastight facilities."
• "The digesters of such plants are usually made of masonry, with paraffin or bituminous paint applied to the gas-flled area in order to make it gastight."
• "Experience had shown that the preparation of prussic acid called Cyclon B caused death with far greater speed and certainty, especially if the rooms were kept dry and gastight and closely packed with people, and provided they were fitted with as large a number of intake vents as possible."