| var. of photo- before a vowel: photalgia. |
| a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compound words: photocopy. |
| phot- pref. Variant of photo-. |
| photo- or phot- pref.
[Greek phōto-, from phōs, phōt-; see bhā-1 in Indo-European roots.] |
photo- or phot-
pref.
Light; radiant energy: photosynthesis.
Photographic: photofluorography.
| photo-
A prefix that means "light," as in photoreceptor. |