The Collaborative International Dictionary of English v.0.48:

Web \Web\ (w[e^]b), v. t. [imp. & p. p. Webbed; p. pr. & vb.
   n. Webbing.]
   To unite or surround with a web, or as if with a web; to
   envelop; to entangle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Webbed \Webbed\, a.
   1. Provided with a web.
      [1913 Webster]

   2. (Zool.) Having the toes united by a membrane, or web; as,
      the webbed feet of aquatic fowls.
      [1913 Webster]

WordNet (r) 3.0 (2006):

webbed
    adj 1: (of the feet of some animals) having the digits connected
           by a thin fold of skin [ant: unwebbed]
    2: having open interstices or resembling a web [syn: lacy,
       netlike, netted, webbed, weblike, webby]