- engineering a weight used in machines to counterbalance a part, as of a crankshaftAlso called: bobweight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for balance weight
At present the balance-weight is so placed that the gyrostat would fall if it were not spinning.
The ball or balance-weight of a clock's pendulum; the weight attached to the plumb-line.