Gastight
Pronunciation : Gas"tight`
Part of Speech : a.
Definition : Defn: So tightly fitted as to preclude the escape of gas; impervious to gas.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder