The Collaborative International Dictionary of English v.0.48:

John \John\ (j[o^]n), n. [See Johannes.]
   A proper name of a man.
   [1913 Webster]

   John-apple, a sort of apple ripe about St. John's Day. Same
      as Apple-john.

   John Bull, an ideal personification of the typical
      characteristics of an Englishman, or of the English
      people.

   John Bullism, English character. --W. Irving.

   John Doe (Law), the name formerly given to the fictitious
      plaintiff in an action of ejectment. --Mozley & W.

   John Doree, John Dory. [John (or F. jaune yellow) +
      Doree, Dory.] (Zool.) An oval, compressed, European food
      fish (Zeus faber). Its color is yellow and olive, with
      golden, silvery, and blue reflections. It has a round dark
      spot on each side. Called also dory, doree, and St.
      Peter's fish.
      [1913 Webster]

WordNet (r) 3.0 (2006):

John Dory
    n 1: European dory [syn: John Dory, Zeus faber]