Source : Webster's Revised Unabridged Dictionary (1913)

Damewort \Dame"wort`\, n. (Bot.)
   A cruciferrous plant ({Hesperis matronalis}), remarkable for
   its fragrance, especially toward the close of the day; --
   called also {rocket} and {dame's violet}. --Loudon.

Source : WordNet®

Hesperis matronalis
     n : long-cultivated herb having flowers whose scent is more
         pronounced in the evening; naturalized throughout Europe
         to Siberia and into North America [syn: {damask violet},
         {Dame's violet}, {sweet rocket}]