English
heptahelical
From hepta- + helical.
A compound of hepta- + helical
Proto-Indo-European *septḿ̥ ‘seven’
Proto-Hellenic *heptə́ ‘seven’
Ancient Greek ἑπτά ‘seven’
English hepta-
Today it means
adj having seven helices; especially describing a portion of a protein having seven associated α-helices
Language periods are conventional ranges, not dates for this word.
Etymograph / heptahelical