ovum
US /ˈoʊ.vəm/
UK /ˈoʊ.vəm/
1.
a mature female reproductive cell, especially of a human or other animal, which can divide to give rise to an embryo usually only after fertilization by a male cell.
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The fertilization of an ovum by a sperm marks the beginning of a new life.
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In vitro fertilization involves combining sperm and ovum outside the body.