trophoblast

noun

tro·​pho·​blast ˈtrō-fə-ˌblast How to pronounce trophoblast (audio)
: the outer layer of the mammalian blastocyst that supplies nutrition to the embryo and facilitates implantation
trophoblastic adjective

Word History

Etymology

International Scientific Vocabulary

First Known Use

1889, in the meaning defined above

Time Traveler
The first known use of trophoblast was in 1889

Dictionary Entries Near trophoblast

Cite this Entry

“Trophoblast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trophoblast. Accessed 29 Nov. 2022.

Medical Definition

trophoblast

noun

tro·​pho·​blast ˈtrō-fə-ˌblast How to pronounce trophoblast (audio)
: 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

trophoblastic adjective

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