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Because this article has content useful to Wikipedia's sister project Wiktionary, it has been transwikied there, and its dictionary counterpart can be found at either Wiktionary:Transwiki:Overflow can, Wiktionary:Overflow can, or Wiktionary:overflow can.
An overflow can is an object (likely a can) that has a spiral tubing out of the side. It is usually straight, but some of them are curved. It is used for measuring the volume of an object (usually an irregular shaped one) by fluid displacement.