Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.chorionic - of or relating to a chorion; "a chorionic villus is a minute vascular projection on the fetal chorion"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
So far 284 pregnant women from thalassemia affected families went through chorionic villus sampling (CVS) test, which is a form of parental diagnosis to determine genetic disorder in unborn child.
President said we can avoid chorionic diseases by adopting precautionary measures and good habits.
Morphological Features of the Human Placenta and its Free Chorionic Villi in Normal Pregnancies and those with Diabetes and High Blood Pressure.
Human chorionic gonadotropin has been known for decades as pregnancy related hormone that can help clinicians in early detection of pregnancy, it acts as a tumor marker in gestational trophoblastic tumors as well.
Training about Ultrasound, SPSS and chorionic villus sampling will also be held.
The quantitative [sz]-human chorionic gonadotrophin ([sz]-<hCGa) was 93,854 UI/L.
Circulating tumor markers (TMs) have a crucial role in decision-making for a limited number of malignancies, including testicular cancer in which human chorionic gonadotropin (hCG), a-fetoprotein, and lactate dehydrogenase have an established clinical application (4).
The undersurface of the chorionic plate showed focal pseudovillous papilliform cytotrophoblastic proliferation (Figure 2(a)).
However, beta human chorionic gonadotropin ([beta]-hCG) was found to be the most predictive marker (9-13).
However, the distinctive contribution of its individual parts, amniotic and chorionic membranes, to these effects is still unknown.