ver·so 
(vûrsō)
(vûrsō)n. pl. ver·sos
1. A left-hand page of a book or the reverse side of a leaf, as opposed to the recto.
2. The back of a coin or medal.
[New Latin versō (foliō), (with the page) turned, verso, from Latin versō, ablative of versus, past participle of vertere, to turn; see VERSION.]