Source : Webster's Revised Unabridged Dictionary (1913)

Blackcap \Black"cap`\ (-k[a^]p`), n.
   1. (Zo["o]l.)
      (a) A small European song bird ({Sylvia atricapilla}),
          with a black crown; the mock nightingale.
      (b) An American titmouse ({Parus atricapillus}); the
          chickadee.

Source : WordNet®

blackcap
     n 1: raspberry native to eastern North America having black
          thimble-shaped fruit [syn: {black raspberry}, {blackcap
          raspberry}, {thimbleberry}, {Rubus occidentalis}]
     2: small black-headed European gull [syn: {laughing gull}, {pewit},
         {pewit gull}, {Larus ridibundus}]
     3: Chickadee having a dark crown [syn: {black-capped chickadee},
         {Parus atricapillus}]
     4: small brownish-gray warbler with a black crown [syn: {Silvia
        atricapilla}]