|Easton's Bible Dictionary|
Occurs only in Jeremiah 6:29, in relation to the casting of metal. Probably they consisted of leather bags similar to those common in Egypt.
Noah Webster's Dictionary
(n. sing. & pl.) An instrument, utensil, or machine, which, by alternate expansion and contraction, or by rise and fall of the top, draws in air through a valve and expels it through a tube for various purposes, as blowing fires, ventilating mines, or filling the pipes of an organ with wind.
Int. Standard Bible Encyclopedia
bel'-oz, bel'-us: The word occurs once only in English Versions of the Bible, in Jeremiah 6:29, where the prophet is predicting the coming of the destroyer (verse 26), "a great nation" from "the north country" (verse 22), down upon Israel, because "all of them deal corruptly" (verse 28). "The bellows blow fiercely; the leads is of the fire." Here the imagery is drawn from the refiner's art, and the "bellows" are those used to make the refiner's fires burn fiercely.
See CRAFTS, II, 10.
Bellows (1 Occurrence)
Jeremiah 6:29 The bellows blow fiercely; the lead is consumed of the fire: in vain do they go on refining; for the wicked are not plucked away. (WEB KJV JPS ASV DBY WBS YLT NAS RSV NIV)