English
interpolar
From inter- + polar.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *kʷel-
…
Proto-Hellenic *pólos
Ancient Greek πόλος ‘pivot, hinge, axis, pole’
Latin polus ‘pole’
Late Latin polāris ‘of or pertaining to the poles’
English polar
Today it means
adj between poles
Language periods are conventional ranges, not dates for this word.
Etymograph / interpolar