emphysema (n.)

1660s, "distention with air or other gasses," from Modern Latin, from Greek emphysema "swelling, inflation" (of the bowels, etc.), from emphysan "to blow in, inflate; to play the flute," from assimilated form of en "in" (see en- (2)) + physan "to blow," from physa "breath, blast" (see pustule). Related: Emphysematous (adj.).