"pertaining to the diaphragm," 1704, from Modern Latin phrenicus, from Greek phrēn "the diaphragm, muscle which parts the heart and lungs from the digestive organs" (see phreno-) + -ic.
phrase
phraseology
phrasing
phreak
phrenetic
phrenic
phreno-
phrenology
Phrygian
phthisic
phthisis