English
heptone
From hepta- + -one.
Formed from hepta- + -one
Proto-Indo-European *septḿ̥ ‘seven’
Proto-Hellenic *heptə́ ‘seven’
Ancient Greek ἑπτά ‘seven’
English hepta-
The story
Does not conform to IUPAC nomenclature and the coining probably precedes the current conventions.
Today it means
noun A liquid hydrocarbon, C₇H₁₀, of the valylene series.
Language periods are conventional ranges, not dates for this word.
Etymograph / heptone