(1):

(n.) A manuscript written on papyrus; esp., pl., written scrolls made of papyrus; as, the papyri of Egypt or Herculaneum.

(2):

(n.) The material upon which the ancient Egyptians wrote. It was formed by cutting the stem of the plant into thin longitudinal slices, which were gummed together and pressed.

(3):

(n.) A tall rushlike plant (Cyperus Papyrus) of the Sedge family, formerly growing in Egypt, and now found in Abyssinia, Syria, Sicily, etc. The stem is triangular and about an inch thick.