from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Impermeable by gas.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. impermeable to gases
from the GNU version of the Collaborative International Dictionary of English
- adj. So tightly fitted as to preclude the escape of gas; impervious to gas.
from The Century Dictionary and Cyclopedia
- Sufficiently tight to prevent the escape of gas: frequently applied to stoppers or other appliances for closing bottles, etc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not allowing air or gas to pass in or out
Sorry, no etymologies found.