[1] : 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      now superseded by the bayonet.
      1913 webster

   2. a pointed head or spike; esp., one in the center of a
      shield or target. --beau.  fl.
      1913 webster

   3. a hayfork. obs. or prov. eng. --tusser.
      1913 webster

   4. a pick. prov. eng. --wright. raymond.
      1913 webster

   5. a pointed or peaked hill. r.
      1913 webster

   6. a large haycock. prov. eng. --halliwell.
      1913 webster

   7. a turnpike; a toll bar. --dickens.
      1913 webster

   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.
      1913 webster

   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.
         1913 webster

   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
      balaenoptera rostrata, having an elongated snout; --
      called also piked whale.

   sand pike zool., the lizard fish.

   sea pike zool., the garfish
      a .
          1913 webster
see also:
pie pick peak pique esox lucius pickerel 
gedd luce jack wall-eye gar pike 
gar pike perch stizostedion lucioperca sauger 
pike pole pike whale balaenoptera rostrata piked whale sand pike 
sea pike 

[2] : WordNet (r) 2.0

esox lucius
     n : voracious piscivorous pike of waters of northern hemisphere
         syn: northern pike
see also:
northern pike 

Lucius >> L Words
Lucius, definition of term: Lucius
lucius_pag1.html

Esox >> E Words
Esox, definition of term: Esox
esox_pag1.html