The Collaborative International Dictionary of English v.0.48:
Trophic \Troph"ic\, a. [Gr. ? nursing. See Trophi.] (Physiol.) Of or connected with nutrition; nitritional; nourishing; as, the so-called trophic nerves, which have a direct influence on nutrition. [1913 Webster]WordNet (r) 3.0 (2006):
trophic adj 1: of or relating to nutrition; "a trophic level on the food chain"