extraembryonic

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ex·tra·em·bry·on·ic

 (ĕk′strə-ĕm′brē-ŏn′ĭk)
adj.
Of or being a structure that is outside the embryo: extraembryonic membranes.

extraembryonic

(ˌɛkstrəˌɛmbrɪˈɒnɪk)
adj
(Biology) biology outside the embryo

ex•tra•em•bry•on•ic

(ˌɛk strəˌɛm briˈɒn ɪk)

adj.
1. situated outside the embryo.
2. pertaining to structures that lie outside the embryo.
References in periodicals archive ?
On the other hand, because salamander embryos contain pluripotent cells they had the raw material to evolve completely new structures such as extraembryonic membranes, which are fundamental to the development of reptiles and mammals.
Histology of extraembryonic membranes during extended egg retention in Sceloporus aeneus (Squamata: Phrynosomatidae).
In carnivores, ruminants, horses, and swine, the extraembryonic membranes expand to fill the lumen of the uterus.