from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See blastula.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A blastula
from the GNU version of the Collaborative International Dictionary of English
- n. The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum.
from The Century Dictionary and Cyclopedia
- n. In embryology: A hollow sphere (vesicular morula) composed of a single layer of blastomeres or derivative cells, inclosing a central cavity or blastocœle.
- n. By Haeckel restricted to the germ-vesicle, vesicular embryo, or blastodermic vesicle of the Mammalia, which follows after gastrulation, and is called by him a gastrocystis, or intestinal germ-vesicle. Also called blastula.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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
Sorry, no etymologies found.