photoautotroph

This term is a technical biological classification used primarily in scientific discourse, textbooks, and academic research. It describes a specific metabolic strategy where an organism utilizes light as its energy source and inorganic carbon (usually carbon dioxide) as its carbon source. It is the opposite of a chemoautotroph, which derives energy from chemical reactions rather than light.

In a practical sense, the word is used to categorize a wide range of life forms, from microscopic cyanobacteria to giant sequoia trees. Because it is a precise taxonomic descriptor, it lacks the casual connotations of words like "plant" or "greenery," which are more general and less focused on the specific biochemical mechanism of carbon fixation.