antigas

Countering military gas attacks.

The company gas officer is responsible through his gas noncommissioned officer for taking over the antigas trench stores[…]

Nevertheless, it is obvious from the elaborate anti-gas precautions which have been taken by all concerned that little reliance is placed by the Allied Powers upon the assurance of our enemies being observed in all eventualities, and enemy anti-gas precautions may be regarded not improperly as an indication of the recognition that any breach of the Geneva Protocol by a gas attack upon ourselves or our allies would be met by immediate reprisals.

Countering gas (condition of the digestive system).

Antigas medicine for babies is really effective when they're newborns and seem to always have gas pain.