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n. pl. pre-em·bry·os
A fertilized ovum up to 14 days old, before it becomes implanted in the uterus.

pre-em′bry·on′ic (-ŏn′ĭk) adj.


(Biology) the structure formed after fertilization of an ovum but before differentiation of embryonic tissue
References in periodicals archive ?
The management of predicted ovarian hyperstimulation involving gonadotropin-releasing hormone analog with elective cryopreservation of all pre-embryos.
22 NO 3:319 (Stage-specific expression of lanosterol 14[alpha]-demethylase in mice oocyte might be related to fertilization and pre-embryos development).
The doctors "sold" some of the genetic material for research and implanted some pre-embryos into different women, possibly resulting in live births.
Among the nine topics in this issue of the annual produced by the Institute of Jewish Law at Boston University are early interpretations of the Bible and Talmud as a reflection of Medieval legal realia, Genesis in Western canon law, conspicuous religious symbols in the public schools of France and the US, and a rabbinical court decision regarding a dispute over the fate of pre-embryos.
Call the subjects of these experiments blastocysts, surplus embryos, pre-embryos, whatever, but don't let on that they're what all humans are at that stage of our development.
Cryopreserved sperm and pre-embryos can survive for many years; the success rate with frozen ova is poor.
of the Pittsburgh Theological Seminary, testified that the mainline Protestant denomination, United Church of Christ, believes pre-embryos should be granted great respect, but noted that the church is not categorically opposed to stem cell research on embryos.
The other is a definition according to which early embryos are called pre-embryos.
This has been done with human pre-embryos following IVF so that the cells could be cultured to discover if the pre-embryos were at risk for cystic fibrosis.
Robertson, "In the Beginning: The Legal Status of Early Embryos," Virginia Law Review 76 (1990) 437-517; Board of Trustees, American Medical Association, "Frozen Pre-embryos," Journal of the American Medical Association 263 (1990) 2484-87; and Alexander Morgan Capron, "At Law--Parenthood and Frozen Embryos: More Than Property and Privacy," Hastings Center Report 22/5 (1992) 32-33.
Mary Sue Davis wanted to have the pre-embryos implanted in her uterus in a further attempt to become pregnant, while Junior Davis wanted them left frozen.
It is not necessary for this court to engage in a legal, medical or philosophical discussion whether the pre-embryos in this case are `children' or whether Becky Litowitz is legally their parent," wrote Justice Charles Z.