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The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

[Greek khorion; see gherə- in Indo-European roots.]

cho′ri·on′ic (-ŏn′ĭk) adj.
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Adj.1.chorionic - of or relating to a chorion; "a chorionic villus is a minute vascular projection on the fetal chorion"
References in periodicals archive ?
The risk of miscarriage following genetic Amniocentesis and Chorionic Villus Sampling was investigated in randomized clinical trials in the 1980's and early 1990's13,14.
Few substances have been so neglected and misunderstood regarding its potential therapeutic actions as hCG, the acronym for Human Chorionic Gonadotropin.
When a pregnancy implants, it produces human chorionic gonadotropin (hCG), which supports the early pregnancy.
The four types of ovulation agents are gonadotrophins, gonadotrophins-releasing hormone, human chorionic gonadotrophin and clomifene.
Used primarily as a female fertility treatment, human chorionic gonadotropin also is popular among users of performance-enhancing drugs.
Pregnancy hypertension and pre-eclampsia are associated with placental malfunction, including altered levels of hormones such as oestrogen and human chorionic gonadotropin.
amniocentesis and chorionic villus sampling, would not be morally acceptable.
Macri Technologies, which holds patents related to free beta Human Chorionic Gonadotropin (free Beta hCG), a peptide hormone recognized as a biomarker for trimester prenatal risk assessment.
Both amniocentesis and another procedure called chorionic villus sampling, in which doctors pluck bits of the placenta, isolate fetal cells that can reveal many genetic problems in an unborn baby with near certainty.
COPENHAGEN -- An investigational prenatal diagnostic test that uses fetal cells taken from maternal endocervical mucus could offer all the advantages of chorionic villus sampling, according to a study sponsored by Biocept Inc.
Serum [beta]-human chorionic gonadotropin was negative.