| Colorless, flammable gas |
| Like noxious gases |
| Most common of the noble gases |
| Gases or vapors that are dangerous to inhale |
| Elementary gases |
| Inactive, as gases |
| One of the inert gases |
| Accumulate gases on the surface |
| Colorless solvent |
| Colorless: Slang. |
| Swamp gases |
| Colorless, flammable gas used as an anesthetic |
| Colorless, inactive gas |
| Colorless gases |
| Inert gases |
| One of the noble gases |
| Of air or gases: Comb. form |
| Colorless, flammable liquids |
| What charcoal does to gases |
| Red gases (anag) |
| Certain gases |
| Dry, colorless brandy |
| Colorless solvents |
| Refinery gases |
| Colorless gas |
| Org. concerned with greenhouse gases |
| One of the inert gases in the periodic table of elements |
| Some nonreactive gases |
| Colorless solvent used in paints |
| One of the 6 noble gases |