Source : Webster's Revised Unabridged Dictionary (1913)

Picker \Pick"er\, n. [From {Pick}.]
   1. One who, or that which, picks, in any sense, -- as, one
      who uses a pick; one who gathers; a thief; a pick; a
      pickax; as, a cotton picker. ``Pickers and stealers.''
      --Shak.

   2. (Mach.) A machine for picking fibrous materials to pieces
      so as to loosen and separate the fiber.

   3. (Weaving) The piece in a loom which strikes the end of the
      shuttle, and impels it through the warp.

   4. (Ordnance) A priming wire for cleaning the vent.

Source : WordNet®

picker
     n 1: a person who chooses or selects out [syn: {chooser}, {selector}]
     2: someone who gathers crops or fruits etc.