(n.) A gaseous compound of carbon and hydrogen, in the proportion of two atoms of the former to two of the latter. It is a colorless gas, with a peculiar, unpleasant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant.

Dry Ice Freon acetylene argon asphyxiating gas butane carbon dioxide carbon monoxide castor-bean meal chlorine coal gas commercial fertilizer compost coolant dressing dung enrichener ethane ether ethyl chloride ethylene fertilizer fluorine formaldehyde freezing mixture guano helium hydrogen ice ice cubes illuminating gas krypton lewisite liquid air liquid helium liquid oxygen manure marsh gas methane muck mustard gas natural gas neon night soil nitrate nitrogen organic fertilizer oxygen ozone phosphate poison gas propane radon refrigerant sewer gas superphosphate xenon