Brechnuss f (genitive Brechnuss, plural Brechnüsse)
- strychnine tree (nux vomica (Strychnos nux-vomica, syn. Strychnos vomica, Strychnos spireana), a deciduous tree native to southeast Asia, a member of family Loganiaceae.
- Jatropha curcas, a species of flowering plant in the spurge family, Euphorbiaceae, that is native to the American tropics, most likely Mexico and Central America.
Declension of Brechnuss