English
allocycle
From allo- + cycle, coined by geologists.
Proto-Indo-European *h₂el- ‘beyond, other’
Proto-Indo-European *h₂élyos ‘other, another’
Proto-Hellenic *áľľos
Ancient Greek ἄλλος ‘other’
English allo-
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
The story
From allo- + cycle, coined by geologists.
Today it means
noun A cycle in rock formation whose major forces come from outside the formation via tectonics, volcanism, climate change, or other outside forces, as contrasted with being contained within the formation.
Language periods are conventional ranges, not dates for this word.
Etymograph / allocycle