{ ‖Al‐lan″to‐is (�), Al‐lan″toid (�), } n.. (Anat.) A membranous appendage of the embryos of mammals, birds, and reptiles, — in mammals serving to connect the fetus with the parent; the urinary vesicle.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.