snakeroot, snakeweed, Also called: Easter-ledges a Eurasian polygonaceous plant, Polygonum bistorta, having leaf stipules fused to form a tube around the stem and a spike of small pink flowers
2.
Also called: snakeroot a related plant, Polygonum bistortoides, of W North America, with oval clusters of pink or white flowers
3.
any of several other plants of the genus Polygonum
[C16: from French bistorte, from Latin bis twice + tortus from torquēre to twist]