Source : Webster's Revised Unabridged Dictionary (1913)

Knickknack \Knick"knack`\, n. [See {Knack}.]
   A trifle or toy; a bawble; a gewgaw.

Source : WordNet®

knickknack
     n 1: a small inexpensive mass-produced article [syn: {novelty}]
     2: miscellaneous curios [syn: {bric-a-brac}, {nicknack}, {knickknackery},
         {whatnot}]