/ ˈbeləʊz; NAmE -loʊz/ noun
( pl. bel·lows ) [ C +sing./pl. v . ] a piece of equipment for blowing air into or through sth. Bellows are used for making a fire burn better or for producing sound in some types of musical instruments :
a pair of bellows (= a small bellows with two handles to be pushed together)
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WORD ORIGIN
Middle English : probably from Old English belga , plural of belig bag , of Germanic origin, from a base meaning swell, be inflated, used as a shortened form of earlier blǣstbelig blowing bag .