What does "bindweed" mean?

Bindweed: A plant of the genus Convolvulus; as, greater bindweed (C. Sepium); lesser bindweed (C. arvensis); the white, the blue, the Syrian, bindweed. The black bryony, or Tamus, is called black bindweed, and the Smilax aspera, rough bindweed. The fragile bindweed bells and bryony rings. Tennyson.