Source : Webster's Revised Unabridged Dictionary (1913)

Phrenic \Phren"ic\, a.[Gr. ?, ?, 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.

Source : WordNet®

phrenic
     adj : of or relating to the diaphragm; "phrenic nerve"