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abortion-inducing drug (trade name RU_486) developed in France; when taken during the first five weeks of pregnancy it blocks the action of progesterone so that the uterus sloughs off the embryo abortion pill , mifepristone , RU 486
accessory or adjoining anatomical parts or appendages (especially of the embryo) adnexa , annexa
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) amnion , amnios , amniotic sac
membrane around fetus or embryo amnion , chorion
serous fluid in which the embryo is suspended inside the amnion amnionic fluid , amniotic fluid , waters
fluid-filled cavity that surrounds the developing embryo amniotic cavity
fluid around embryo and fetus amniotic fluid
male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization androgenesis , androgeny
(botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization apogamy
early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs blastodermic vesicle , blastula
cavity in the mesoderm of an embryo that gives rise in humans to the pleural cavity and pericardial cavity and peritoneal cavity celom , celoma , coelom
outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) chorion
comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and dist class Dicotyledonae , class Dicotyledones , class Magnoliopsida , Dicotyledonae , Dicotyledones , Magnoliopsida
comprising seed plants that produce an embryo with a single cotyledon and parallel-veined leaves: includes grasses and lilies and palms and orchids; divided into four subclasses or superorders: Alismatidae; Arecidae; Commelinidae; and Liliidae class Liliopsida , class Monocotyledonae , class Monocotyledones , Liliopsida , Monocotyledonae , Monocotyledones
seed plant, leaf of the embryo of cotyledon
animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds egg
cell of an embryo embryonic cell , formative cell
tissue in an embryo embryonic tissue
nutritive tissue surrounding the embryo within seeds of flowering plants endosperm
alimentary canal (especially of an embryo or a coelenterate) enteron
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