autotroph

n. microorganism which independently produces the compounds which are necessary for its survival

An autotroph (from the Greek autos = self and trophe = nutrition) is an organism that produces complex organic compounds from simple inorganic molecules and an external source of energy, such as light or chemical reactions of inorganic compounds. Autotrophs are considered producers in a food chain. Plants and other organisms that carry out photosynthesis are phototrophs (or photoautotrophs). Bacteria that utilize the oxidation of inorganic compounds such as hydrogen sulfide, ammonium or ferrous iron as an energy source are chemoautotrophs (some are known as lithotrophs).
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Autotroph /au·to·troph/ an autotrophic organism. au·to·troph n. An organism capable of synthesizing its own food from inorganic substances using [more]Autotroph - Community and Resources

Noun
1. plant capable of synthesizing its own food from simple organic substances
(synonym) autophyte, autophytic plant, autotrophic organism
(hypernym) plant, flora, plant life

n. autotroph, microorganism which independently produces the compounds which are necessary for its survival