zona pellucida
/ˌzəʊnəpɪˈluːsɪdə/noun
(pl. zonae pellucidae /-niːpɪˈluːsɪdiː/)
- Anatomy & Zoology the thick transparent membrane surrounding a mammalian ovum before implantation【剖, 动】透明带, 卵膜。
词源
mid 19th cent.: from Latin， literally 'pellucid girdle'.