Etymology
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sprue (n.)

"piece of metal (later plastic) attached to a cast object," 1875, earlier (1849) "channel through which metal is poured into a mold;" of unknown origin.

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Definitions of sprue

sprue (n.)
a chronic disorder that occurs in tropical and non-tropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation;
Synonyms: tropical sprue / psilosis
From wordnet.princeton.edu