pho·to·troph 
(fōtə-trŏf′, -trōf′)
(fōtə-trŏf′, -trōf′)n.
An organism that is capable of using light energy to synthesize sugars and other organic molecules from carbon dioxide. Green plants, algae, and cyanobacteria are phototrophs. Also called photoautotroph.
pho′to·trophic adj.
pho′to·trophi·cal·ly adv.