American Heritage® Dictionary of the English Language, Fourth Edition
- n. The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.
Century Dictionary and Cyclopedia
- n. 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. By analogy — The membrana putaminis or egg-pod of those eggs which have calcareous shells.
- n. The external investment of the ovum of an insect, derived from the epithelial layer of the oviduct.
- n. Same as corium.
- n. In botany, the pulpy matter which fills the young ovule and is absorbed during development.
- n. anatomy, biology The protective and nutritive membrane in higher vertebrates that attaches the fetus to the uterus.
- n. biology, entomology The outer case of an insect egg.
- n. botany The outer membrane of seeds of plants.
GNU Webster's 1913
- n. The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development.
- n. The true skin, or cutis.
- n. (Bot.) The outer membrane of seeds of plants.
- n. the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
- From Late Latin chorion, from Ancient Greek χοριον ("membrane surrounding the fetus, afterbirth"). (Wiktionary)
- Greek khorion; see gherə- in Indo-European roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Covering the external face of the amnion and lining the inner face of the chorion is a double membrane, _the allantois_.”
“On the other hand, the villi on that part of the chorion which is in contact with the decidua placentalis increase greatly in size and complexity, and hence this part is named the chorion frondosum (Fig. 28).”
“The inter-twin membrane has two layers (amnion-amnion) in monochorionic gestations, which appear thin, versus three layers (amnion-chorion-amnion) in dichorionic gestations.”
“TRAP occurs when there is a monochoriotic pregnancy in which the fetuses are contained within the same (mono) outer membrane of the sac that surrounds the fetus (the chorion).”
“The membranes amnion and chorion create the amniotic sac that surrounds your baby.”
“Made up of the membranes amnion and chorion that create the sac that surrounds your baby.”
“Some MZ twins, for example, may not share the same placenta and chorion membrane.”
“Traditional methods depended on an assessment of phenotypic resemblance or on the condition of the membranes at birth (twins contained within a single chorion are always MZ, though the converse is not true).”
“She knelt down beside an unconscious Red Nasat who had lost chunks of his chorion shell.”
“Each embryo, as in the case of quadrupeds, is provided with a chorion and separate membranes.”
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