烯

烯 (Kangxi radical 86, 火+7, 11 strokes, cangjie input 火大大月 (FKKB), four-corner 9482₇, composition ⿰火希)

• Kangxi Dictionary: page 671, character 10
• Dai Kanwa Jiten: character 19037
• Dae Jaweon: page 1080, character 7
• Hanyu Da Zidian (first edition): volume 3, page 2205, character 4
• Unihan data for U+70EF

Phono-semantic compound (形聲／形声) : semantic 火 (“fire”) + phonetic 希, the latter being derived from 稀 (xī, “rare”) of which it is the phonetic element. This is coined in light of the observed lack of hydrogens (as compared to alkanes) in alkenes and the fact that alkenes are flammable.

Compare 烷 (wán, “alkane”), 炔 (quē, “alkyne”).

烯

1. (organic chemistry) alkene