Source : Webster's Revised Unabridged Dictionary (1913)

Curio \Cu"ri*o\ (k?"r?-?), n.; pl. {Curios} (-?z). [Abbreviation
   of curiosity.]
   Any curiosity or article of virtu.

Source : WordNet®

curio
     n : something unusual -- perhaps worthy of collecting [syn: {curiosity},
          {oddity}, {oddment}, {peculiarity}, {rarity}]