The Collaborative International Dictionary of English v.0.48:

Bindweed \Bind"weed`\, n. (Bot.)
   A plant of the genus Convolvulus; as, greater bindweed
   (Convolvulus Sepium); lesser bindweed (Convolvulus
   arvensis); the white bindweed, the blue bindweed, the
   Syrian bindweed. The black bryony, or Tamus, is called
   black bindweed, and the Smilax aspera, rough bindweed.
   [1913 Webster]

         The fragile bindweed bells and bryony rings.
                                                  --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bindweed
    n 1: any of several vines of the genera Convolvulus and
         Calystegia having a twining habit