Acetylene
WordNet
noun
(1) A colorless flammable gas used chiefly in welding and in organic synthesis
WiktionaryText
Noun
- Any organic compound having one or more carbon-carbon triple bond; an alkyne.
- Ethyne; the simplest alkyne, a hydrocarbon of formula HC≡CH. It is a colourless gas, with a peculiar, unpleasant odour, formerly used as an illuminating gas, but now used in welding or metallurgy.