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blastocyst

[blas-tuh-sist] /ˈblæs tə sɪst/
noun, Embryology
1.
the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast.
Origin
1885-1890
1885-90; blasto- + -cyst
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blastocysts

blastocyst

/ˈblæstəʊˌsɪst/
noun (embryol)
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blastocysts

blastocyst

n.

1876, from blasto- + cyst.

Online Etymology Dictionary, © 2010 Douglas Harper
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blastocysts in Medicine

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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blastocysts in Science
blastocyst
  (blās'tə-sĭst')   
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 Article for blastocysts

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

Learn more about blastocyst with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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