tormentil

noun

tor·​men·​til ˈtȯr-mən-ˌtil 

: a yellow-flowered Eurasian cinquefoil (Potentilla erecta synonym P. tormentilla) with a root sometimes used in tanning and dyeing

Word History

Etymology

Middle English turmentille, from Anglo-French, from Medieval Latin tormentilla, from Latin tormentum; from its use in allaying pain

First Known Use

14th century, in the meaning defined above