The Collaborative International Dictionary of English v.0.48:
Phrenic \Phren"ic\ (fr[e^]n"[i^]k), a. [Gr. frh`n, freno`s, the midriff, or diaphragm, the heart, the mind: cf. F. phr['e]nique.] (Anat.) Of or pertaining to the diaphragm; diaphragmatic; as, the phrenic nerve. [1913 Webster]WordNet (r) 3.0 (2006):
phrenic adj 1: of or relating to the diaphragm; "phrenic nerve"