blastocyst

blastocyst

[blas-tuh-sist]
noun Embryology.
the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast.

Origin:
1885–90; blasto- + -cyst

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World English Dictionary
blastocyst (ˈblæstəʊˌsɪst)
 
n
1.  Also called: blastosphere the blastula of mammals: a sphere of cells (trophoblast) enclosing an inner mass of cells and a fluid-filled cavity (blastocoel)
2.  another name for germinal vesicle

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

blastocyst
from Gk. blasto-, comb. form of blastos "sprout, germ" (of unknown origin) + cyst.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

blastocyst blas·to·cyst (blās'tə-sĭst')
n.
The modified blastula stage of mammalian embryos, consisting of the inner cell mass and a thin trophoblast layer enclosing the blastocoel. Also called blastodermic vesicle.


blas'to·cys'tic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
blastocyst   (blās'tə-sĭst')  Pronunciation Key 
The modified blastula that is characteristic of placental mammals. It has an outer layer, known as a trophoblast, that participates in the development of the placenta. The inner layer of cells develops into the embryo.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

blastocyst

a distinctive stage of a mammalian embryo. It is a form of blastula that develops from a berrylike cluster of cells, the morula. A cavity appears in the morula between the cells of the inner cell mass and the enveloping layer. This cavity becomes filled with fluid. The blastocyst differs from the blastula in that it is composed of two already differentiated cell types, the inner cell mass and the enveloping layer

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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