The Collaborative International Dictionary of English v.0.48:

Echinate \Ech"i*nate\, Echinated \Ech"i*na`ted\, a. [L.
   echinatus. See Echinus.]
   Set with prickles; prickly, like a hedgehog; bristled; as, an
   echinated pericarp.

   Syn: echinulate.
        [1913 Webster]