Main Entry: bel·lows

Pronunciation: \ˈbe-(ˌ)lōz, -ləz\

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