Definition of helio- in English:

helio-

Pronunciation: /ˈhiːlɪəʊ/

combining form

Relating to the sun: heliogravure heliostat

Origin

from Greek hēlios 'sun'.

Definition of helio- in:

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Word of the day bimble
Pronunciation: ˈbɪmb(ə)l
verb
walk or travel at a leisurely pace