The Collaborative International Dictionary
Adderwort
Adderwort \Ad"der*wort`\, n. (Bot.) The common bistort or snakeweed ( Polygonum bistorta).
Wiktionary
adderwort
n. The common bistort (''Persicaria bistorta'') or snakeweed.
Usage examples of "adderwort".
Looking more closely, Silence recognized a camisado vine, and then the narrow black flowers of an adderwort.