/ˈhetərəˌträf/ /-trōf/
Noun, pl. heterotrophs
1. An organism which requires an external supply of energy in the form of food as it cannot synthesize its own. (wiktionary.org)
2. An organism that cannot fix carbon and uses organic carbon for growth. (wikipedia.com)
Word origin: From Greek ἕτερος heteros (another, different) and τροφή trophe (nutrition)