chorion

noun

cho·​ri·​on ˈkȯr-ē-ˌän 

: the highly vascular outer embryonic membrane of reptiles, birds, and mammals that in placental mammals is associated with the allantois in the formation of the placenta

Examples of chorion in a Sentence

Recent Examples on the Web

If the split is delayed, usually a week or so after conception, the processes of growing a placenta, chorion, and amniotic sac are already underway. —Pamela Prindle Fierro, Parents, 30 July 2024

This is essentially a blood clot that can occur when the outermost membrane surrounding the embryo (the chorion) separates a little from the uterine wall, allowing some blood to pool in that space between the two. —Amy Marturana, SELF, 28 Dec. 2018

Word History

Etymology

New Latin, from Greek, afterbirth

First Known Use

1545, in the meaning defined above

Rhymes for chorion

• corean
• dorian
• mauryan
• saurian
• gregorian
• historian
• nestorian
• praetorian
• stentorian
• pythagorean
• valedictorian

Kids Definition

chorion

noun

cho·​ri·​on ˈkōr-ē-ˌän 

ˈkȯr-

: the outer membrane that surrounds the embryo of reptiles, birds, and mammals and that in mammals with a placenta contributes to the formation of the placenta

chorionic

ˌkōr-ē-ˈän-ik

ˌkȯr-

adjective

Medical Definition

chorion

noun

cho·​ri·​on ˈkōr-ē-ˌän, ˈkȯr- 

: the highly vascular outer embryonic membrane that is associated with the allantois in the formation of the placenta