Sprue (sprṳ), n. 1. (Founding) (a) Strictly, the hole through which melted metal is poured into the gate, and thence into the mold. (b) The waste piece of metal cast in this hole; hence, dross.
2. (Med.) Same as Sprew.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.