1) Biology terminology 
Chemotrophs are organisms that obtain energy by the oxidation of electron donors in their environments. These molecules can be organic (chemoorganotrophs) or inorganic (chemolithotrophs). The chemotroph designation is in contrast to phototrophs, which utilize solar energy. Chemotrophs can be either autotrophic or heterotrophic. ==Chemoautotroph== ...
(from the article `bacteria`) ...of energy: light, inorganic compounds, and organic compounds. Phototrophic bacteria use photosynthesis to generate cellular energy in the form of ... ...reduced sulfur as an energy source for the fixation of carbon dioxide. Unlike all other known biological communities on Earth, the energy that ... .....
An organism that gets its energy by metabolising organicmaterial taken from other organisms. ... (09 Oct 1997) ... 
(ke´mo-trōf) a microorganism that derives energy from the oxidation of inorganic compounds.
Type: Term Pronunciation: ke′mō-trōf Definitions: 1. An organism that obtains its energy by the oxidation of inorganic or organic nutrients (exogenous chemical sources).
chemotroph Any organism that creates its principal energy source by oxidizing organic or inorganic compounds.
organism that gets its energy from the transfer of electrons originating from chemical compounds
any organism that oxidizes inorganic or organic compounds as its principal energy source.