The round or oval female reproductive body of various animals,including birds,reptiles,amphibians,fishes,and insects,consisting usually of an embryo surrounded by nutrient material and a protective covering.

• 卵鸟类、爬虫、两栖动物、鱼类和昆虫类等多种动物的圆形或椭圆形的雌性再生体，通常由一个被营养物质包围的胚胎和一个保护性覆盖层组成