单词	extraembryonic
释义	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 Word History First Known Use 1901, in the meaning defined above Medical Definition 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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