• WordNet 3.6
    • n chorion the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
    • ***
Webster's Revised Unabridged Dictionary
    • Chorion (Bot) The outer membrane of seeds of plants.
    • Chorion (Anat) The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.
    • Chorion (Anat) The true skin, or cutis.
    • ***
Century Dictionary and Cyclopedia
    • n chorion In anatomy, the outermost fetal envelop; the external membrane which invests the embryo, forming in the higher vertebrates the outer layer of the bag of waters, and contributing to the formation of the placenta. With reference to the embryo, it occupies the relation of the original vitelline membrane or cell-wall of the ovum.
    • n chorion By analogy — The membrana putaminis or egg-pod of those eggs which have calcareous shells.
    • n chorion The external investment of the ovum of an insect, derived from the epithelial layer of the oviduct.
    • n chorion Same as corium.
    • n chorion In botany, the pulpy matter which fills the young ovule and is absorbed during development.
    • ***
Chambers's Twentieth Century Dictionary
    • n Chorion kō′ri-on the outer fœtal envelope: the external membrane of the seeds of plants
    • ***


Webster's Revised Unabridged Dictionary
NL., fr. Gr.
Chambers's Twentieth Century Dictionary


In literature:

The first thing that is formed is the amnios; the next the chorion; and they enwrap the seed round like a curtain.
"The Works of Aristotle the Famous Philosopher" by Anonymous
Chorion: the shell or covering membrane of an insect egg.
"Explanation of Terms Used in Entomology" by John. B. Smith
Three sets of structures are concerned in human embryonic nourishment, namely, the Allantois, the Villi of the Chorion, and the Placenta.
"Embryology" by Gerald R. Leighton
Chorion-epithelioma malignum (deciduoma) was first described in 1889 by Sanger and Pfeiffer.
"Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7" by Various

In news:

Chorionic villi are microscopic projections that line the chorion, the outermost layer of the embryonic sac.
Chorionic villi are microscopic projections that line the chorion, the outermost layer of the embryonic sac.
Pregnancy test s check for the presence of a hormone called beta human chorionic gonadotropin.
American Cancer Society, pregnancy tests work by detecting a hormone called Beta-HCG (human chorionic gonadotropin).
Extracted from the urine of pregnant women, HCG, or human chorionic gonadotropin, was approved in the United States in 1974 for treatment of.
The recent increase in weight loss promotion using injections or oral hCG (human chorionic gonadotropin) provides an opportunity to educate the public of an appropriate approach to weight loss.

In science:

Biol. 195, 659-685 Hamodrakas, S.J., Ekmetzoglou, T. & Kafatos, F.C. (1985) Amino Acid Periodicities ant Their Structural Implications for the Evolutionarily Conservative Central Domain of some Silkmoth Chorion Proteins. J.
A web server to locate periodicities in a sequence