n.
Pronunciation: ə - ' lan-t ə -w ə s
Function: noun
Inflected Form: plural al · lan · to · ides \ ˌ a-l ə n- ' t ō - ə - ˌ d ē z, ˌ a- ˌ lan- \
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 \ ˌ a-l ə n- ' t ō -ik, ˌ a- ˌ lan- \ adjective