Source : Webster's Revised Unabridged Dictionary (1913)

Younker \Youn"ker\, n. [D. jonker, jonkeer; jong young + heer a
   lord, sir, gentleman. See {Young}, a.]
   A young person; a stripling; a yonker. [Obs. or Colloq.]

         That same younker soon was overthrown.   --Spenser.

Source : WordNet®

younker
     n : a young person (especially a young man or boy) [syn: {young
         person}, {youth}, {spring chicken}]