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| albumen |
the nutritive substance surrounding an embryo or seed, such as the white of an egg. [1/2 definitions] |
| amnion |
a thin membranous sac, filled with a watery fluid, that contains the embryo of a mammal, bird, or reptile. |
| archenteron |
the primitive digestive cavity at the center of an embryo that is in the gastrula stage. |
| archiblast |
the outer layer of an embryo in a very early, two-layered stage of development. [1/2 definitions] |
| -blast |
bud, embryo, cell layer, or other generative unit. |
| blastema |
an undifferentiated or primitive mass of cells, as in an embryo or regenerating organ, that is capable of becoming organized into a specific tissue or organ. |
| blastula |
an embryo in an early stage of development that consists of a single layer of cells forming a hollow sphere. |
| chorion |
the outer membrane that protects the embryo in reptiles, birds, and mammals. In mammals, it is part of the amnion. |
| embryectomy |
the surgical removal of an embryo, esp. of one developing outside the uterus. |
| embryology |
the formation and development of an embryo. [1/2 definitions] |
| embryonic |
of, relating to, or in the state of being an embryo. [1/2 definitions] |
| endoderm |
the inner layer of cells of an embryo, which develops into the linings of the digestive tract, certain glands, and other internal organs. |
| endosperm |
tissue that is derived from the embryo sac of a plant and that surrounds and nourishes the embryo. |
| epiblast |
the outer layer of cells of a developing embryo that later becomes the ectoderm, but that also contains cells capable of becoming the mesoderm or endoderm. [1/2 definitions] |
| fetus |
of a higher animal, an unborn young in the later stages of development in the womb, esp. a human embryo after about three months of development. |
| forebrain |
the anterior of the three divisions of the brain of a vertebrate embryo; prosencephalon. [1/2 definitions] |
| gastrula |
an embryo in an early stage of development consisting of two saclike layers of cells that enclose a central cavity. |
| germ |
a rudimentary biological part, such as a bud, seed, or embryo, that gives rise to further growth or development. [1/3 definitions] |
| germ layer |
any of the three primary cell layers in an embryo which differentiate into various body parts as the fetus develops. |
| in vitro fertilization |
a laboratory technique by which a previously extracted ovum, usu. human, is fertilized by previously extracted sperm, producing an embryo that is then implanted in a uterus for gestation. |
| isogenous |
of the same or similar origin; corresponding genetically, as the parts derived from the same tissues of an embryo. |
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