Adjective Satellite
not allowing air or gas to pass in or out
Source: WordNetDuring the 18th century, breech-loading weapons were designed, which allowed the rifleman to reload while under cover, but defects in manufacturing and the difficulty in forming a reliable gas-tight seal prevented widespread adoption. Source: Internet
The corners of the pins would bite into the wire to form a gas-tight (i.e. corrosion-proof, therefore reliable) connection. Source: Internet
Such NMR tubes can be heated without the loss of solvent thanks to the valve's gas-tight seal. Source: Internet