One of the mysteries of the English language finally explained.
Any of several plants thought to resemble a snake in some way, or used to treat snakebites; especially adder's tongue, genus Ophioglossum, and †bistort, Persicaria bistorta (obsolete); compare adderwort. Now historical and rare.
Late Middle English; earliest use found in Medical Recipes. In some forms from adder + grass. In some forms from the genitive of adder + grass.
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