(in embryology) The earliest developmental stage of an organ or tissue, particularly in an embryo; a primordium. The name is taken from a German word meaning ‘foundation, basis’.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。