Definition of alumroot in US English:

alumroot

(also alum root)

noun

North American
  • A heuchera, especially the green-flowered H. americana and the white-flowered H. parvifolia.

    • ‘For dry shade, also try Douglas iris, any of the alum roots, hummingbird sage, sword fern, and foothill sedge.’
    • ‘The amount of alum root in such compounds is 1 ounce.’
    • ‘Heuchera americana, or alum root, is adaptable to sun or shade, given sufficient moisture.’
    • ‘It was called Alum Root Flower because its roots shared the astringent qualities of species of true alum root.’
    • ‘Another plant, also called alum root, was pounded up and used wet to apply to sores and swellings.’

Pronunciation

alumroot

/ˈaləmˌro͞ot/