The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
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, verso] [ant: obverse]