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Table of Contents POS
HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

allantois

POS

Noun

HYPHEN

al=lan=to=is

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WORDNET DICTIONARY

Noun allantois has 1 sense

allantois(n = noun.animal) Array - the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals); Array

is a kind of

fetal membrane

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CIDE DICTIONARY

allantois, n.

A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle. [1913 Webster]

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OXFORD DICTIONARY

allantois, n. (pl. allantoides) Zool. one of several membranes that develop in embryonic reptiles, birds, or mammals.

Derivative

allantoic adj.

Etymology

mod.L f. Gk allantoeides sausage-shaped

For further exploring for "allantois" in Webster Dictionary Online