The Collaborative International Dictionary
Meadowwort
Meadowsweet \Mead"ow*sweet`\, Meadowwort \Mead"ow*wort`\, n. (Bot.) The name of several plants of the genus Spir[ae]a, especially the white- or pink-flowered Spir[ae]a salicifolia, a low European and American shrub, and the herbaceous Spir[ae]a Ulmaria, which has fragrant white flowers in compound cymes.
Wiktionary
meadowwort
n. The plant meadowsweet.