Alternative spelling of photocell

A shade of blue that cannot be detected by graphic-arts camera film, thus useful in the design and print industry for writing notes on layouts to be photographed, or for laying down sketch lines.

having a reaction to, or able to be affected by, light

principally, oxygenic photosynthesis, any process by which plants and algae convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.

(astronomy) A visible surface layer of a star, and especially that of a sun.

A device which photographically records the gamma rays passing through tissue that has been injected with a radioactive material.

(chemistry) A molecular or atomic species that initiates a photochemical reaction

The acquisition of photosensitivity / (chemistry) The transfer of a photon from one excited state to another, which then undergoes a reaction

(transitive) to make something photosensitive

sensitivity to light, especially a heightened response to light