The unsaturated hydrocarbon radical —C≡CH, derived from ethyne (acetylene). Usually attributive.
Today’s NYT Connections Answers Dec 21, #559 - Daily Updates & Hints
Today’s Wordle Answer Dec 21 #1281- NYT Wordle Hints & Updates
NYT Mini Crossword Answers Today - The Mini for Dec 21 Solved
NYT Strands Today - Hints, Spangram & Answers for December 21