The Collaborative International Dictionary of English v.0.48:

Polypoid \Pol"y*poid\, a. [Polyp + -oid.]
   1. (Zool.) Like a polyp; having the nature of a polyp, but
      lacking the tentacles or other parts.
      [1913 Webster]

   2. (Med.) Resembling a polypus in appearance; having a
      character like that of a polypus.
      [1913 Webster]