Bible Dictionaries
Sprue

Webster's Dictionary

(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.

Bibliography Information
Webster, Noah. Entry for 'Sprue'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/sprue.html. 1828.