1. The vascular foetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)

Derived forms: allantoises

See also: allantoic

Type of: fetal membrane

Encyclopedia: Allantois

• diminished
• diminished arch
• diminishing
• diminuendo
• diminution
• diminutive
• diminutiveness
• dimit
• dimity
• dimly
• dimmed
• dimmer
• dimmer switch
• dimness
• Dimocarpus
• Dimocarpus longan
• dimorphic
• dimorphism
• Dimorphotheca
• dimorphous
• dimout
• dimple
• dimpled chad
• dimply
• dimwit