炔

Glyph origin
― smoky.

For the sense “alkyne”, the component is derived from, of which it is also the phonetic element. The character was coined in light of fact that alkynes are flammable (―“fire”), and lack two of the hydrogens compared to alkenes of the homologous series.

Compare and.

Etymology 1
From.

Definitions

 * 1)   alkyne

Definitions

 * 1)  smoky