butynyl

== English == === Etymology === From butyne +‎ -yl. === Noun === butynyl (plural butynyls) (organic chemistry) Either of three isomeric univalent radicals (C4H5-) derived from the two isomers of butyne (C4H6) ==== Usage notes ==== Another univalent radical derived from 1-butyne is not a butynyl, unlike 1-butynyl and 3-butynyl, but a methylpropynyl. ==== Derived terms ====