Source : Webster's Revised Unabridged Dictionary (1913)

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 {S. salicifolia}, a
   low European and American shrub, and the herbaceous {S.
   Ulmaria}, which has fragrant white flowers in compound cymes.