English
heneicosadiene
From hen- + eicosa- + di- + -ene
Formed from hen- + eicosa- + di- + -ene
Proto-Indo-European *dwi- ‘two’
Proto-Indo-European *déḱm̥ ‘ten’
Proto-Indo-European *(h₁)wídḱm̥ti ‘twenty’
Proto-Hellenic *ewī́kəti
Ancient Greek εἴκοσι ‘twenty’
English eicosa-
Today it means
noun An unsaturated aliphatic hydrocarbon that has 21 carbon atoms and two double bonds, but especially 3,6-heneicosadiene
Language periods are conventional ranges, not dates for this word.
Etymograph / heneicosadiene