extraembryonic
adjective
ex·tra·em·bry·on·ic
ˌek-strə-ˌem-brē-ˈä-nik 
: situated outside the embryo
especially
: developed from the zygote but not part of the embryo
extraembryonic membranes
Cite this Entry
“Extraembryonic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extraembryonic. Accessed 31 Oct. 2025.
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extraembryonic
adjective
ex·tra·em·bry·on·ic
-ˌem-brē-ˈän-ik
: situated outside the embryo proper
especially
: developed from the zygote but not part of the embryo
extraembryonic membranes
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