1= germinal disc (now rare).
2The area of a seed which contains the embryo (compare sense 2b.
Late 19th century; earliest use found in Haeckel's Evolution of Man.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。