Meaning of photoautotroph

pho•to•au•to•troph

Pronunciation: (fō"tō-ô'tu-trof", -trōf"), [key]
— n. Biol.
  1. any organism that derives its energy for food synthesis from light and is capable of using carbon dioxide as its principal source of carbon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.