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air·tight

[air-tahyt]
adjective
1.
preventing the entrance or escape of air or gas.
2.
having no weak points or openings of which an opponent may take advantage: an airtight contract.

Origin:
1750–60; air1 + tight

air·tight·ly, adverb
air·tight·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
airtight (ˈɛəˌtaɪt) [Click for IPA pronunciation guide]
 
adj
1.  not permitting the passage of air either in or out
2.  having no weak points; rigid or unassailable: this categorization is hardly airtight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
More airtight is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

airtight
"impervious to air," 1760, from air (1) + tight. Fig. sense of "incontrovertible" (of arguments, alabis, etc.) is from 1929.
Online Etymology Dictionary, © 2010 Douglas Harper
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