Source : Webster's Revised Unabridged Dictionary (1913)

Seamless \Seam"less\, a.
   Without a seam.

         Christ's seamless coat, all of a piece.  --Jer. Taylor.

Source : WordNet®

seamless
     adj 1: not having or joined by a seam or seams; "seamless
            stockings" [ant: {seamed}]
     2: used especially of skin; "his cheeks were unlined"; "his
        unseamed face" [syn: {unlined}, {unseamed}]
     3: perfectly consistent and coherent; "the novel's seamless
        plot"