trophoblast

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tro·pho·blast

 (trō′fə-blăst′)
n.
The outermost layer of cells of the mammalian blastocyst that attaches the fertilized ovum to the uterine wall and serves as a nutritive pathway for the embryo.

tro′pho·blas′tic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

trophoblast

(ˈtrɒfəˌblæst)
n
(Biology) the outer layer of cells of the embryo of placental mammals, which is attached to the uterus wall and absorbs nourishment from the uterine fluids
[C19: from tropho- + -blast]
ˌtrophoˈblastic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

troph•o•blast

(ˈtrɒf əˌblæst, ˈtroʊ fə-)

n.
the layer of extraembryonic ectoderm that nourishes the embryo or develops into fetal membranes with nutritive functions.
[1885–90]
troph`o•blas′tic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.trophoblast - the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
blastosphere, blastula - 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
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
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