Heterotroph
An organism capable of deriving energy for life processes only from the decomposition of organic compounds, and incapable of using inorganic compounds as sole sources of energy or for organic synthesis. Most animals are heterotrophic and rely on directly or indirectly (carnivores) eating most plants that are "autotrophic."
Glossary. M.S. Ashton et al. (eds.), Managing Forest Carbon in a Changing Climate,DOI 10.1007/978-94-007-2232-3, © Springer Science + Business Media B.V. 2012
Organism non capable of self-nourishment utilizing carbon dioxide or carbonates as the sole source of carbon and obtaining energy from radiant energy or from the oxidation of inorganic elements, or compounds such as iron, sulphur, hydrogen, ammonium and nitrites. Opposite: autotroph.
FAO Glossary of Biotechnology for Food and Agriculture, 2001 (http://www.fao.org/biotech/index_glossary.asp?lang=en).