What is "diacetylene"

n. 1 (context chemistry English) A highly unsaturated hydrocarbon, HC≡C-C≡CH, the simplest polyyne 2 (context chemistry English) Any of its derivatives, R₂C≡C-C≡CR₂, used in the manufacture of polydiacetylene

Diacetylene (also known as butadiyne) is the organic compound with the formula (CH). It is the simplest compound containing two triple bonds. It is first in the series of polyynes, which are of theoretical but not of practical interest.