verso

n. left-hand page; opposite side of a page or a coin

The recto is the right-hand page and the verso the left-hand page ("verso" can also mean to turn over in the mind) of a folded sheet or bound item, such as a book, broadsheet, or pamphlet. These are terms of art in the binding, printing, and publishing industries, and can be applied more broadly to any field where physical documents are exchanged.
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Noun
1. left-hand page
(antonym) recto
(hypernym) page
2. the side of a coin or medal that does not bear the principal design
(synonym) reverse
(hypernym) side
(hyponym) tail
(part-holonym) coin

n. verso, left-hand page; opposite side of page or coin

n. back, verso, reverse