Compounds arising by replacement of one or both hydrogen atoms of acetylene (ethyne) by a metal or other cationic group. E.g. NaC≡CH monosodium acetylide. By extension, analogous compounds derived from terminal acetylenes, RC≡CH., ühendid, mis tekivad etüüni ühe või mõlema vesiniku aatomi asendamisel metalli aatomiga