draining board
noun
a sloping grooved surface at the side of a sink, used for draining washed dishes, etcAlso called: drainer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for draining board
Historical Examples of draining board
The draining-board, grooved and inclined towards the cold water tub.
The Gastronomic Regenerator:Alexis Soyer