oocyte vs. ovum

oocyte

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noun

1. an immature egg cell of the animal ovary; in humans, one oocyte matures during the menstrual cycle, becoming an ootid and then an ovum, while several others partially mature and then disintegrate.

ovum

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noun,

Cell Biology.
1. the female reproductive cell or gamete of animals, which is capable of developing, usually only after fertilization, into a new individual.
2. the female reproductive cell or gamete of plants.
1. an oval ornament, as in an egg-and-dart molding.