ovum [ˈəʊvəm]

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n.卵，卵子，卵形装饰

a reproductive cell produced by a woman or female animal

One way is taking the cell from a fertilized ovum.一种方法是从受精卵中取出细胞。
How does a zygote differ from an ovum?受精卵和卵细胞有何不同？