English

heliophysics

From helio- + physics.

Proto-Indo-European *sóh₂wl̥ ‘sun’

Proto-Hellenic *hāwélios ‘sun’

Ancient Greek ἥλιος ‘sun’

Proto-Indo-European *bʰuH- ‘to become, grow’

…

Latin physica ‘study of nature’

Old French fisike ‘natural science’

Middle English phisik

English physic

Today it means

noun The physics of the Sun and its interactions with objects within the heliosphere

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

Etymograph / heliophysics