<biochemistry> Systems of metabolism in which energy is derived from endogenous chemical reactions rather than from food or light energy, for example in deep sea hot spring organisms. ... (18 Nov 1997) ... 
Systems of metabolism in which energy is derived from endogenous chemical reactions rather than from food or light-energy, eg. in deep-sea hot-spring organisms.
chemotrophy The bending of a plant or plant organ in response to a chemical stimulus.