What is "esox lucius"

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 It is now superseded by the bayonet.

2. A pointed head or spike; esp., one in the center of a shield or target.
   --Beau. & Fl.

3. A hayfork. [Obs. or Prov. Eng.]
   --Tusser.

4. A pick. [Prov. Eng.]
   --Wright. Raymond.

5. A pointed or peaked hill. [R.]

6. A large haycock. [Prov. Eng.]
   --Halliwell.

7. A turnpike; a toll bar.
   --Dickens.

8. (Zo["o]l.) 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.

   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.

   Gar pike. See under Gar.

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

   Sand pike (Zo["o]l.), the lizard fish.

   Sea pike (Zo["o]l.), the garfish (a) .