Source : Webster's Revised Unabridged Dictionary (1913)

Verso \Ver"so\, n. [L. versus, p. p. of vertere to turn: cf. F.
   verso.] (Print.)
   The reverse, or left-hand, page of a book or a folded sheet
   of paper; -- opposed to {recto}.

Source : WordNet®

verso
     n 1: left-hand page [ant: {recto}]
     2: the side of a coin or medal that does not bear the principal
        design [syn: {reverse}] [ant: {obverse}]