What is "egophony"

Egophony \E*goph"o*ny\, n. [Gr. ?, ?, goat + ? voice.] (Med.) The sound of a patient's voice so modified as to resemble the bleating of a goat, heard on applying the ear to the chest in certain diseases within its cavity, as in pleurisy with effusion.

n. (context medicine English) A bleating sound sometimes observed in patients with various lung conditions

Egophony (British: Aegophony) is an increased resonance of voice sounds heard when auscultating the lungs, often caused by lung consolidation and fibrosis. It is due to enhanced transmission of high-frequency sound across fluid, such as in abnormal lung tissue, with lower frequencies filtered out. It results in a high-pitched nasal or bleating quality in the affected person's voice.