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The Collaborative International Dictionary
Bicolligate

Bicolligate \Bi*col"li*gate\,

  1. [L. bis twice + colligatus, p. p. See Colligate, v. t. ] (Zo["o]l.) Having the anterior toes connected by a basal we

Wiktionary
bicolligate

a. (context ornithology English) Having the anterior toes united by a basal web