simple past tense and past participle of heliograph

(astronomy) The region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System.

plural of heliochrome

plural of heliodor

plural of heliodon

(physics, chemistry) The property of certain photochromic materials of colouring in near-ultraviolet light and then fading in its absence; they are used in the lenses of sunglasses

Describing electric power generated by the rays of the sun

plural of heliobacterium

Any of the Heliobacteriaceae, a family of photoheterotrophic bacteria, using bacteriochlorophyll to convert light energy into chemical energy, exclusively in anaerobic conditions

(pathology) A bluish colouration of the skin that is a symptom of Spanish influenza