recto

[rek-toh] /ˈrɛk toʊ/
noun, plural rectos. Printing.
1.
a right-hand page of an open book or manuscript; the front of a leaf (opposed to verso).
Origin
1815-25; < Late Latin rēctō (foliō) on the right-hand (leaf or page), ablative of Latin rēctus right
British Dictionary definitions for recto

recto

/ˈrɛktəʊ/
noun (pl) -tos
1.
the front of a sheet of printed paper
2.
the right-hand pages of a book, bearing the odd numbers Compare verso (sense 1b)
Word Origin
C19: from Latin rectus right, in rectō foliō on the right-hand page
Word Origin and History for recto
n.

"right-hand page in an open book" (opposed to verso or reverso), 1824, from Latin recto (in recto folio), ablative of rectum "right," (see right (adj.1)).