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allantois definition

al·lan·tois (ə lan′tō is)

noun pl. allantoides al′·lan·to′i·des′ (al′ən tō′ə dēz′)

a membranous pouch with a rich blood supply in the embryos of birds, reptiles, and mammals: it is an organ of respiration and excretion for embryonic birds and reptiles: in mammals it helps form the placenta

Etymology: ModL < Gr allantoeidēs, sausage-shaped < allas, sausage (prob. < dial. allē, garlic, via Oscan *allo < L alium, allium) + -eidēs, -oid

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