First Known Use: 1646
Dictionary
allantois
noun al·lan·to·is \ə-ˈlan-tə-wəs\
plural al·lan·to·ides \ˌa-lən-ˈtō-ə-ˌdēz, ˌa-ˌlan-\
Definition of ALLANTOIS
: 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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Origin of ALLANTOIS
New Latin, ultimately from Greek allant-, allas sausage
Medical Dictionary
allantois
noun al·lan·to·is \ə-ˈlant-ə-wəs\
plural al·lan·to·ides \ˌal-ən-ˈtō-ə-ˌdēz, ˌal-ˌan-\
Medical Definition of ALLANTOIS
: a vascular fetal membrane of reptiles, birds, or 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
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