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chorioallantois

Noun CEFR C2

Definitions

The vascular extraembryonic membrane, formed by the fusion of the allantois and the chorion, that makes up the placenta in most mammals; the chorioallantoic membrane

CEFR level

C2
Mastery
This word is part of the CEFR C2 vocabulary — mastery level.
See all C2 English words →

See also

chorioamnion chorioamnionitis chorioangioma chorioangiosis chorioblastoma choriocapillaris

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