The Collaborative International Dictionary of English v.0.48:

Web-toed \Web"-toed`\, a.
   Having the toes united by a web for a considerable part of
   their length.
   [1913 Webster]

WordNet (r) 3.0 (2006):

web-toed
    adj 1: having feet with webbed toes [syn: web-footed, web-
           toed]