adjheterotrophicrequiring organic compounds of carbon and nitrogen for nourishment"most animals are heterotrophic"
Century Dictionary and Cyclopedia
heterotrophicNot self-sustaining; dependent upon others for food. Since all animals depend, either immediately or ultimately, upon plants for food, they are sometimes termed heterotrophic, in contrast with the autotrophic or self-sustaining plants. See autotrophic.
It is obvious that the metabolic processes of the autotrophic plants are very different from those of the heterotrophic type of plants.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher