interpolar

Etymology tree
Proto-Indo-European *h₁én
Proto-Indo-European *h₁entér
Proto-Italic *n̥ter
Latin inter
Latin inter-bor.
English inter-
Proto-Indo-European *kʷel-der.
Proto-Indo-European *kʷól-os
Proto-Hellenic *pólos
Ancient Greek πόλος (pólos)der.
Latin polus
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālis
Latin -āris
Late Latin polārislbor.
English polar
English interpolar
From inter- + polar.