|allantois (ə-lān'tō-ĭs) Pronunciation Key
Plural allantoides (āl'ən-tō'ĭ-dēz')
A membranous sac that grows out of the lower end of the alimentary canal in embryos of reptiles, birds, and mammals. In mammals, the blood vessels of the allantois develop into the blood vessels of the umbilical cord.
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.