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allantoisOne entry found. Main Entry: al·lan·to·is Pronunciation: \ə-ˈlan-tə-wəs\ Function: noun Inflected Form(s): plural al·lan·to·ides \ˌa-lən-ˈtō-ə-ˌdēz, ˌa-ˌlan-\ Etymology: New Latin, ultimately from Greek allant-, allas sausage Date: 1646 : a vascular fetal membrane of reptiles, birds, and mammals that is formed as a pouch from the hindgut and that in placental mammals is intimately associated with the chorion in formation of the placenta — al·lan·to·ic \ˌa-lən-ˈtō-ik, ˌa-ˌlan-\ adjective
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