Definition of adder's grass in English:

adder's grass

noun

historical, rare
  • 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 .

Pronunciation

adder's grass

/ˈadəz ˌɡrɑːs/ /ˈadəz ˌɡras/

Origin

Late Middle English; earliest use found in Medical Recipes. In some forms from adder + grass.