sorrel¹ /sorˈl/

1. Any of the acid-tasting species of herbs of the dock genus, Rumex (common sorrel R. acetosa; sheep's sorrel R. acetosella; French or Roman sorrel R. scutatus) or the related Oxyria digyna (mountain sorrel)
2. Applied also to other plants such as roselle and wood sorrel

sorrel tree noun

The sourwood (qv)

salts of sorrel

A very poisonous combination of potassium acid oxalate and oxalic acid

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