Definition of helio- in English:

helio-

Pronunciation: /ˈhiːlɪəʊ/

combining form

Relating to the sun: heliogravure heliostat

Origin

from Greek hēlios 'sun'.

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Definition of helio- in:

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar