Definition of chorion in English:

chorion

Line breaks: chor|ion
Pronunciation: /ˈkɔːrɪən
 
/

noun

Embryology
The outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals it contributes to the formation of the placenta.
More example sentences
  • In insects, the genes that encode the proteins of the egg membrane, the chorion, become amplified in the surrounding follicle cells.
  • A needle was used to roll the embryo out of the chorion.
  • Care was exercised not to separate the amniotic sac into its components, the chorion and amnion.

Origin

mid 16th century: from Greek khorion.

Derivatives

chorionic

Pronunciation: /ˌkɒrɪˈɒnɪk/
adjective
More example sentences
  • Amniotic fluid, chorionic villi, or fetal serum can be tested for evidence of West Nile virus infection.
  • Triple screening should not replace amniocentesis or chorionic villous sampling in pregnancies at high risk for trisomy 21.
  • These authors found ultrastructural evidence of altered endothelial and smooth muscle cells within chorionic vessels exhibiting HEV-like lesions.

Definition of chorion in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day bouffant
Pronunciation: bo͞oˈfänt
adjective
styled to puff out in a rounded shape...