What is the X in X-mas?
heterotroph het·er·o·troph (hět'ər-ə-trŏf', -trōf')
An organism that cannot synthesize its own food and is dependent upon complex organic substances for nutrition.
An organism that cannot manufacture its own food and instead obtains its food and energy by taking in organic substances, usually plant or animal matter. All animals, protozoans, fungi, and most bacteria are heterotrophs. Compare autotroph.
heterotrophic adjective (hět'ər-ə-trŏf'ĭk)