English

heliopolar

From helio- + polar.

Proto-Indo-European *sóh₂wl̥ ‘sun’

Proto-Hellenic *hāwélios ‘sun’

Ancient Greek ἥλιος ‘sun’

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 Relating to, or measured according to, the poles of the Sun.

Language periods are conventional ranges, not dates for this word.

Etymograph / heliopolar