Sprue

Definition:

(n.) Strictly, the hole through which melted metal is poured into the gate, and thence into the mold.
(n.) The waste piece of metal cast in this hole; hence, dross.
(n.) Same as Sprew.

Compare sprue with other words:

spree vs. sprue

sprue vs. sprug

spruce vs. sprue

spray vs. sprue

flash vs. sprue

metal vs. sprue

disease vs. sprue