Polypi

from The Collaborative International Dictionary of English v.0.48

Polypi \Pol"y*pi\, n. pl. [NL.] (Zool.)
   The Anthozoa.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Polypus \Pol"y*pus\, n.; pl. E. {Polypuses}, L. {Polypi}. [L.
   See {Polyp}.]
   1. (Zool.) Same as {Polyp}.
      [1913 Webster]

   2. (Med.) A tumor, usually with a narrow base, somewhat
      resembling a pear, -- found in the nose, uterus, etc., and
      produced by hypertrophy of some portion of the mucous
      membrane.
      [1913 Webster]