Relating to or containing the acetylenyl chemical group, which is a hydrocarbon radical consisting of carbon and hydrogen atoms bonded in a specific way.
From acetylene (a hydrocarbon gas made from calcium carbide) plus the suffix -yl (denoting a chemical radical or group). Acetylene itself comes from acetic acid combined with the -ene suffix for unsaturated hydrocarbons.
Acetylenyl compounds were historically important in early 20th-century chemistry and medicine; acetylene torches became famous for welding because of the intense heat produced by burning acetylene gas.
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