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.