Source : Webster's Revised Unabridged Dictionary (1913)

   {Pigeon grass} (Bot.), a kind of foxtail grass ({Setaria
      glauca}), of some value as fodder. The seeds are eagerly
      eaten by pigeons and other birds.

   {Pigeon hawk}. (Zo["o]l.)
      (a) A small American falcon ({Falco columbarius}). The
          adult male is dark slate-blue above, streaked with
          black on the back; beneath, whitish or buff, streaked
          with brown. The tail is banded.
      (b) The American sharp-shinned hawk ({Accipiter velox, or
          fuscus}).

   {Pigeon hole}.
      (a) A hole for pigeons to enter a pigeon house.
      (b) See {Pigeonhole}.
      (c) pl. An old English game, in which balls were rolled
          through little arches. --Halliwell.

   {Pigeon house}, a dovecote.

   {Pigeon pea} (Bot.), the seed of {Cajanus Indicus}; a kind of
      pulse used for food in the East and West Indies; also, the
      plant itself.

   {Pigeon plum} (Bot.), the edible drupes of two West African
      species of {Chrysobalanus} ({C. ellipticus} and {C.
      luteus}).

   {Pigeon tremex}. (Zo["o]l.) See under {Tremex}.

   {Pigeon wood} (Bot.), a name in the West Indies for the wood
      of several very different kinds of trees, species of
      {Dipholis}, {Diospyros}, and {Coccoloba}.

   {Pigeon woodpecker} (Zo["o]l.), the flicker.

   {Prairie pigeon}. (Zo["o]l.)
      (a) The upland plover.
      (b) The golden plover. [Local, U.S.]

Source : WordNet®

pigeon hawk
     n : small falcon of Europe and America having dark plumage with
         black-barred tail; used in falconry [syn: {merlin}, {Falco
         columbarius}]