Source : Webster's Revised Unabridged Dictionary (1913)

Size \Size\, v. t. [imp. & p. p. {Sized}; p. pr. & vb. n.
   {Sizing}.]
   To cover with size; to prepare with size.

Sized \Sized\, a.
   1. Adjusted according to size.

   2. Having a particular size or magnitude; -- chiefly used in
      compounds; as, large-sized; common-sized.

Source : WordNet®

sized
     adj 1: having a specified size [ant: {unsized}]
     2: having the surface treated or coated with sizing [ant: {unsized}]