extraembryonic / ˌɛk strəˌɛm briˈɒn ɪk /

📖毕业后词汇胚胎外胚胎外的胚外胚胎外骨骼

extraembryonic 的定义

adj. 形容词 adjective
  1. situated outside the embryo.
  2. pertaining to structures outside the embryo.