Pa·rel·la Pa·relle n. Bot. (a) A name for two kinds of dock (Rumex Patientia and Rumex Hydrolapathum). (b) A kind of lichen (Lecanora parella) once used in dyeing and in the preparation of litmus.
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Wa·ter dock Bot. A tall, coarse dock growing in wet places. The American water dock is Rumex orbiculatus, the European is Rumex Hydrolapathum.
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