[1] : The Collaborative International Dictionary of English v.0.48

papyrus \papy"rus\, n.; pl. papyri. l., fr. gr. pa`pyros.
   see paper.
   1. bot. 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.
      1913 webster

   2. 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.
      1913 webster

   3. a manuscript written on papyrus; esp., pl., written
      scrolls made of papyrus; as, the papyri of egypt or
      herculaneum.
      1913 webster
see also:
papyri paper cyperus papyrus 

[2] : WordNet (r) 2.0

cyperus papyrus
     n : tall sedge of the nile valley yielding fiber that served
         many purposes in historic times syn: papyrus, egyptian
         paper reed, egyptian paper rush, paper rush, paper
         plant
see also:
papyrus egyptian paper reed egyptian paper rush paper rush paper plant 

Papyrus >> P Words
Papyrus, definition of term: Papyrus
papyrus_pag1.html

Cyperus >> C Words
Cyperus, definition of term: Cyperus
cyperus_pag1.html