A heliochrome is a color photograph, particularly one made by the early experimental processes of the middle 19th to early 20th centuries. The word was coined from the Greek roots `helios`, the sun, and `chroma`, color, to mean `colored by the sun`. It was applied to images as technologically diverse as Levi Hill`s `Hillotypes` of the 185...
• (n.) A photograph in colors.
He'li·o·chrome noun [ Helio- + Greek ... color.] A photograph in colors. R. Hunt.