The Collaborative International Dictionary of English v.0.48:

Columbine \Col"um*bine\, n. [LL. columbina, L. columbinus
   dovelike, fr. columba dove: cf. F. colombine. Perh. so called
   from the beaklike spurs of its flowers.]
   1. (Bot.) A plant of several species of the genus
      Aquilegia; as, Aquilegia vulgaris, or the common
      garden columbine; Aquilegia Canadensis, the wild red
      columbine of North America.
      [1913 Webster]

   2. The mistress or sweetheart of Harlequin in pantomimes.
      --Brewer.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Aquilegia vulgaris
    n 1: common European columbine having variously colored (white
         or blue to purple or red) short-spurred flowers;
         naturalized in United States [syn: granny's bonnets,
         Aquilegia vulgaris]