Sealed or constructed in a way that prevents gas from passing in or out; airtight with respect to gases.
From 'gas' (from Dutch 'gas,' coined by chemist Van Helmont) + 'tight' (from Germanic roots meaning firm/sealed). 19th-century coinage for laboratory and industrial use.
Scientists needed this word once chemistry became serious about measuring gases in the 1800s—a gastight seal could mean the difference between a successful experiment and a complete failure!
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