ovum
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source: By Mia Nicolacoudis - Own work, CC BY 4.0
noun (plural ova |ˈōvə| ) Biology
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:
〘生物〙 卵(らん), 卵子
e.g. the ovum contributes one chromosome of each pair to the fertilized cell.
ORIGIN
early 18th century: from Latin, literally ‘egg’.