<p><strong>Noun:</strong></p><ul><li>An opening through which molten metal is poured into a mold.</li><li>The waste metal left in this opening after casting.</li><li>A channel in a forging die permitting the die to clear that part of the rough piece not being forged.</li></ul><p><strong>Verb:</strong></p><ul><li>To cut the sprues from (a casting).</li></ul>