Offprints are copies of a publication that are printed separately from the main edition. Antonyms for the word "offprints" could include "originals," which refers to the primary copies of a publication, or "reprints," which are additional copies of a publication produced from the same printing plates as the original. Other antonyms could include "digital copies," which are electronic versions of a publication, or "manuscripts," which are the handwritten or typewritten drafts of a publication. "Non-authorized copies" or "pirated copies" could also be considered antonyms, referring to illegal reproductions of a publication without permission from the copyright holder.