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egg cell
The egg cell, or ovum, is the female reproductive cell (gamete) in oogamous organisms. The egg cell is typically not capable of active movement, and it is much larger (visible to the naked eye) than the motile sperm cells. When egg and sperm fuse, a diploid cell (the zygote) is formed, which gradually grows into a new organism.
==Animals==
In animals, egg cells are also known as ova (singular ovum, from the Latin word ''ovum'' meaning egg or egg cell). The term ovule is used for the young ovum of an animal. In higher animals, ova are produced by female gonads (sexual glands) called ovaries and all of them are present at birth in mammals and mature via oogenesis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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