Dictionary:

recto

  (rĕk'tō)

A right-hand page of a book or the front side of a leaf, on the other side of the verso.

[From Latin (foliō) rēctō, (the leaf) being right, ablative of rēctus, straight, right.]

recto, the front side of a printed sheet; thus the right‐hand (and odd‐numbered) page in a book, as opposed to the verso, which is the left‐hand, even‐numbered page on the other side.

The noun has one meaning:

Meaning #1: right-hand page
  Antonym: verso (meaning #1)