Waste metal

• Nutrients are not absorbed
• Dross
• Metal left over after casting
• A chronic disorder that occurs in tropical and nontropical forms and in both children and adults
• Opening to a mold

Wikipedia Word definitions in Wikipedia
A sprue is the passage through which liquid material is introduced into a mold. In many cases it controls the flow of metal into the mold. During casting or molding , the material in the sprue will solidify and need to be removed from the finished part. ...

WordNet Word definitions in WordNet
n. a chronic disorder that occurs in tropical and nontropical forms and in both children and adults; nutrients are not absorbed; symptoms include foul-smelling diarrhea and emaciation [syn: tropical sprue ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"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.