Source : Webster's Revised Unabridged Dictionary (1913)

Two-sided \Two"-sid`ed\, a.
   1. Having two sides only; hence, double-faced; hypocritical.

   2. (Biol.) Symmetrical.

Source : WordNet®

two-sided
     adj 1: capable of being reversed or used with either side out; "a
            reversible jacket" [syn: {reversible}] [ant: {nonreversible}]
     2: having two sides or parts [syn: {bilateral}] [ant: {unilateral},
         {multilateral}]