You searched for: “amphoriloquy
amphoriloquy (s), amphoriloquies (pl) (noun forms)
Similar to the sound produced by blowing or speaking into an amphora (two-handled vase), or other large vessel with a small mouth, as in "amphoric resonance"; a cough, an echo, a voice, etc.: "His amphoriloquy indicated a voice sound that had a hollow, blowing characteristic, which could be heard because of the patient's pulmonary cavity (space in the lung when part of it is removed) as he or she talks or whispers."