sexto

noun
  1. A size of paper, originally made by folding a sheet of paper into six leaves, each leaf being one-sixth of the original size. noun
    The book was printed in sexto, making it compact and easy to carry.
    She preferred her notebooks in sexto size for convenience.
  2. In historical contexts, a book or manuscript that is in a format where each sheet is folded into six leaves. noun
    The library had a rare collection of sextos from the 18th century.
    He discovered an old sexto in the attic, filled with handwritten notes.