n. The official IUPAC name for the organic chemical compound acetylene. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H2.
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n. a colorless flammable gas used chiefly in welding and in organic synthesis
Word Usage
"Ideally, of course, you would also know many of the answers - that the Battle of Chickamauga happened in 1863, or that acetylene is the common name of ethyne - but, for most of us, that's the hardest part."