helio-

prefix

combining form of Greek ἥλιος sun

Wiktionary

Pronunciation: /ˈhi.li.oʊ/

prefix

Etymology: Etymology tree Proto-Indo-European *sóh₂wl̥ Proto-Indo-European *sh₂wél(i)yos Proto-Hellenic *hāwélios Ancient Greek ἥλῐος (hḗlĭos) English helio- Representing a combining form of Ancient Greek ἥλιος (hḗlios, “sun”).

Concerning the sun.