Definition of “recto”
noun:
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The front side of a flat object which is to be examined visually, as for reading, such as a sheet or a leaf or a coin or a medal.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Therefore, (printing) the right-hand page of a book of a script which reads from left to right, usually having an odd page number.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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