Definition of water dock
1 : any of several docks growing in wet places: such as a : a coarse erect European perennial dock herb (Rumex hydrolapathum) with a much-branched inflorescence b : a very similar dock (R. orbiculatus) of eastern North America
2 : golden club
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Origin and Etymology of water dock
Middle English waterdokke, from water + dokke, dock, docke dock
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