Century Dictionary and Cyclopedia
- Those vertebrates in which an allantois is developed. Considered as a group in zoology, the Allantoidea consist of mammals, birds, and reptiles, as distinguished from
Anallantoidea, or amphibians and fishes. The word is synonymous with Amnionata, as distinguished from Anamnionata.
GNU Webster's 1913
- n. (Zoöl.) The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals.
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