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From Biology-Online Dictionary | Biology-Online Dictionary
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An opening cut through the waterway and bulwarks of a ship, so that water falling on deck may flow overboard; called also scupper hole. Scupper hose, a plug to stop a scupper.

Origin: OF. Escopir, escupir, to spit, perhaps for escospir, L. Ex _ conspuere to spit upon; pref. Con- _ spuere to spit. Cf. Spit.