n.
Pronunciation: ' be-( ˌ )l ō z, -l ə z
Function: noun plural but singular or plural in construction
Etymology: Middle English bely, below, belwes ― more at BELLY
Date: before 12th century
1 : an instrument or machine that by alternate expansion and contraction draws in air through a valve or orifice and expels it through a tube also : any of various other blowers
2 : LUNGS
3 : the pleated expansible part in a camera also : a metallic or plastic flexible and expansible vessel