A nephelometer that uses a photocell to measure the intensity of transmitted light.

plural of photoneutron

plural of photoneutrino

plural of photonephelometer

plural of photonuclear reaction

A story illustrated with photographs and text captions.

plural of photonovel

(historical, rare) A nephoscope registering by photography, typically consisting of a pair of cameras used simultaneously.

plural of photonephograph

A nastic response to a change in light levels.