English
heterocycle
From hetero- + cycle.
Proto-Indo-European *sem- ‘one, whole’
Proto-Indo-European *sḿ̥teros
Proto-Hellenic *hə́teros
Ancient Greek ἕτερος ‘other, another, different’
English hetero-
Proto-Indo-European *kʷel- ‘to turn’
…
Proto-Hellenic *kúklos ‘circle, wheel’
Ancient Greek κύκλος ‘circle, ring’
Late Latin cyclus
Middle English cicle ‘fixed length period of years’
English cycle
Today it means
noun A heterocyclic compound or ring.
Language periods are conventional ranges, not dates for this word.
Etymograph / heterocycle