[foh-tuh-trof, -trohf]
noun Biology.
any organism that uses light as its principal source of energy.

1940–45; photo- + -troph

phototrophic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phototroph (ˈfəʊtəʊˌtrɒf)
an organism that obtains energy from sunlight for the synthesis of organic compounds

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
phototroph   (fō'tə-trŏf')  Pronunciation Key 
An organism that manufactures its own food from inorganic substances using light for energy. Green plants, certain algae, and photosynthetic bacteria are phototrophs. Also called photoautotroph.
The American Heritage® Science Dictionary
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