English
heptadienal
From hepta- + dienal.
Proto-Indo-European *septḿ̥ ‘seven’
Proto-Hellenic *heptə́ ‘seven’
Ancient Greek ἑπτά ‘seven’
English hepta-
Today it means
noun Any aliphatic aldehyde having seven carbon atoms and two double bonds, but especially 2,4-heptadienal.
Language periods are conventional ranges, not dates for this word.
Etymograph / heptadienal