bitterroot

noun

1. (countable, uncountable)Lewisia rediviva, a small, low, pink flower with a yellow center.
2. (countable, uncountable)Apocynum androsaemifolium (fly-trap dogbane).
3. (countable, uncountable)Gentiana lutea (great yellow gentian, bitterwort)

adj

1. (attributive, not-comparable, usually)Having bitter roots.