The Collaborative International Dictionary of English v.0.48:

Pike \Pike\, n. [F. pique; perhaps of Celtic origin; cf. W. pig
   a prick, a point, beak, Arm. pik pick. But cf. also L. picus
   woodpecker (see Pie magpie), and E. spike. Cf. Pick, n. &
   v., Peak, Pique.]
   1. (Mil.) A foot soldier's weapon, consisting of a long
      wooden shaft or staff, with a pointed steel head. It is
      now superseded by the bayonet.
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   2. A pointed head or spike; esp., one in the center of a
      shield or target. --Beau. & Fl.
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   3. A hayfork. [Obs. or Prov. Eng.] --Tusser.
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   4. A pick. [Prov. Eng.] --Wright. Raymond.
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   5. A pointed or peaked hill. [R.]
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   6. A large haycock. [Prov. Eng.] --Halliwell.
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   7. A turnpike; a toll bar. --Dickens.
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   8. (Zool.) sing. & pl. A large fresh-water fish (Esox
      lucius), found in Europe and America, highly valued as a
      food fish; -- called also pickerel, gedd, luce, and
      jack.
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   Note: Blue pike, grass pike, green pike, wall-eyed pike, and
         yellow pike, are names, not of true pike, but of the
         wall-eye. See Wall-eye.
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   Gar pike. See under Gar.

   Pike perch (Zool.), any fresh-water fish of the genus
      Stizostedion (formerly Lucioperca). See Wall-eye,
      and Sauger.

   Pike pole, a long pole with a pike in one end, used in
      directing floating logs.

   Pike whale (Zool.), a finback whale of the North Atlantic
      (Bal[ae]noptera rostrata), having an elongated snout; --
      called also piked whale.

   Sand pike (Zool.), the lizard fish.

   Sea pike (Zool.), the garfish
      (a) .
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The Collaborative International Dictionary of English v.0.48:

Wall-eye \Wall"-eye`\, n. [See Wall-eyed.]
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   1. An eye in which the iris is of a very light gray or
      whitish color; -- said usually of horses. --Booth.
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   Note: Jonson has defined wall-eye to be "a disease in the
         crystalline humor of the eye; glaucoma." But glaucoma
         is not a disease of the crystalline humor, nor is
         wall-eye a disease at all, but merely a natural
         blemish. --Tully. In the north of England, as Brockett
         states, persons are said to be wall-eyed when the white
         of the eye is very large and distorted, or on one side.
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   2. (Zool.)
      (a) An American fresh-water food fish (Stizostedion
          vitreum) having large and prominent eyes; -- called
          also glasseye, pike perch, yellow pike, and
          wall-eyed perch.
      (b) A California surf fish (Holconotus argenteus).
      (c) The alewife; -- called also wall-eyed herring.
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WordNet (r) 3.0 (2006):

pike perch
    n 1: any of several pike-like fishes of the perch family [syn:
         pike-perch, pike perch]