Definition of heliotype in English:

heliotype

noun

historical
  • A picture obtained from a sensitized gelatin film exposed to light.

    • ‘Books illustrated with heliotypes occur in larger editions.’
    • ‘A group of etchings and heliotypes reveal technologies the artist used to make his art more accessible to the collecting public.’
    • ‘Wheeler's volumes were illustrated by heliotypes.’
    • ‘Fine heliotypes such as this one are inherently uncommon, and only encountered with great patience, diligence, and some luck.’

Pronunciation

heliotype

/ˈhiːlɪətʌɪp/