phrenoptosis

phren·op·to·si·a

, phrenoptosis (fren'op-tō'sē-ă, -sis)
An abnormal sinking down of the diaphragm.
[phreno- + G. ptōsis, a falling]

phrenoptosis

(frĕn″ŏp-tō′sĭs) [Gr. phren, diaphragm, + ptosis, a dropping]
Downward displacement of the diaphragm.