tormentil

 
Pronunciation: /ˈtɔːm(ə)ntɪl/

noun

  • a low-growing Eurasian plant with bright yellow flowers. The root is used in herbal medicine to treat diarrhoea.
    • Potentilla erecta, family Rosaceae

Origin:

late Middle English: from French tormentille, from medieval Latin tormentilla, of unknown origin