Where does “heneicosadiene” come from?

heneicosadiene (English) comes from English di-, from Latin dī-, from Ancient Greek δί-, from Ancient Greek διά, from Proto-Indo-European dwís, from Proto-Indo-European dwóh₁ — two.

heneicosadiene (English): An unsaturated aliphatic hydrocarbon that has 21 carbon atoms and two double bonds, but especially 3,6-heneicosadiene

Definitions

An unsaturated aliphatic hydrocarbon that has 21 carbon atoms and two double bonds, but especially 3,6-heneicosadiene

Ancestry of “heneicosadiene”, step by step

Step	Language	Word	Meaning
1	English	di-	API; two, twice, or double; Alternative form of...
2	Latin	dī-	Two, double; di
3	Ancient Greek	δί-	Twice, double
4	Ancient Greek	διά	throughout
5	Proto-Indo-European	dwís	twice, doubly; in two
6	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from English di- →Every word from Proto-Indo-European dwís →