Sprue

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

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.