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Organism obtaining its food in a specified way: autotroph; chemotroph.
1 suffix meaning "that which nourishes an embryo": embryotroph, hemotroph, histotroph.
2 suffix meaning an "organism that gets nourishment from a (specified) source": autotroph, metatroph, prototroph.
-troph[Gr. trophē, nourishment]
Suffix. meaning nutrient material, food.