trophoblast
noun
tro·pho·blast
ˈtrō-fə-ˌblast 
: the outer layer of the mammalian blastocyst that supplies nutrition to the embryo and facilitates implantation
Examples of trophoblast in a Sentence
Recent Examples on the Web
There the trophoblasts divide rapidly, forming projections that radiate into the uterus.
—
Adrian Erlebacher, Scientific American, 1 Oct. 2017
Its hollow shell is made of cells that will form the placenta (called trophoblast stem cells, or TSCs) and the yolk sac (the extra-embryonic endoderm, or XEN cells).
—Philip Ball, Quanta Magazine, 13 June 2023
Less than a week after a sperm fertilizes an egg, specialized cells called trophoblasts emerge on the surface of the embryo.
—Adrian Erlebacher, Scientific American, 1 Oct. 2017
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Adrian Erlebacher, Scientific American, 1 Oct. 2017
Its hollow shell is made of cells that will form the placenta (called trophoblast stem cells, or TSCs) and the yolk sac (the extra-embryonic endoderm, or XEN cells).
—Philip Ball, Quanta Magazine, 13 June 2023
Less than a week after a sperm fertilizes an egg, specialized cells called trophoblasts emerge on the surface of the embryo.
—Adrian Erlebacher, Scientific American, 1 Oct. 2017
Dictionary Entries Near trophoblast
Cite this Entry
“Trophoblast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trophoblast. Accessed 22 Nov. 2024.
Copy CitationMedical Definition
trophoblast
noun
tro·pho·blast
ˈtrō-fə-ˌblast
: the outer layer of the mammalian blastocyst that supplies nutrition to the embryo, facilitates implantation by eroding away the tissues of the uterus with which it comes in contact allowing the blastocyst to sink into the cavity formed in the uterine wall, and differentiates into the extraembryonic membranes surrounding the embryo
called also trophoderm
Love words? Need even more definitions?
Merriam-Webster unabridged
Share