tetterwort

from The Century Dictionary.

• noun The larger celandine, Chelidonium majus, so named from its use in cutaneous diseases; also, in America, sometimes the bloodroot, Sanguinaria Canadensis.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A plant used as a remedy for tetter, -- in England the calendine, in America the bloodroot.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun UK A plant used as a remedy for tetter Chelidonium majus
• noun US Sanguinaria canadensis, the bloodroot.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant