Source : Webster's Revised Unabridged Dictionary (1913)

Grackle \Grac"kle\, n. [Cf. L. graculus jackdaw.] (Zo["o]l.)
   (a) One of several American blackbirds, of the family
       {Icterid[ae]}; as, the rusty grackle ({Scolecophagus
       Carolinus}); the boat-tailed grackle (see Boat-tail); the
       purple grackle ({Quiscalus quiscula}, or {Q.
       versicolor}). See {Crow blackbird}, under {Crow}.
   (b) An Asiatic bird of the genus {Gracula}. See {Myna}.

Source : WordNet®

grackle
     n 1: glossy black Asiatic starling often taught to mimic speech
          [syn: {hill myna}, {Indian grackle}, {Gracula religiosa}]
     2: long-tailed American blackbird having iridescent black
        plumage [syn: {crow blackbird}]