any of various plants of the genus Stachys, such as S. arvensis (field woundwort), having purple, scarlet, yellow, or white flowers and formerly used for dressing wounds: family Lamiaceae (labiates)
2.
any of various other plants used in this way
woundwort in American English
(ˈwundˌwɜrt)
noun
any of various plants, esp. betony, formerly used in dressing wounds