periblast 胚周層; 表胎層
peri·blast /ˈpɛrəˌblæst/ 名詞 胚周區,表胚層
Per·i·blast a. Biol. The protoplasmic matter which surrounds the entoblast, or cell nucleus, and undergoes segmentation. -- Per*i*blas*tic, a. ◄ ►