Source : Webster's Revised Unabridged Dictionary (1913)

Asymmetric \As`ym*met"ric\, Asymmetrical \As`ym*met"ri*cal\, a.
   [See {Asymmetrous}.]
   1. Incommensurable. [Obs.]

   2. Not symmetrical; wanting proportion; esp., not bilaterally
      symmetrical. --Huxley.

Source : WordNet®

asymmetric
     adj : characterized by asymmetry in the spatial arrangement or
           placement of parts or components [syn: {asymmetrical}]
           [ant: {symmetrical}]