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noun Cell Biology.
- one of a pair of structurally dissimilar gametes, the female gamete being large and nonmotile and the male gamete being small and motile.
- Characterized by or having small motile male gametes and large nonmotile female gametes.
- A female gamete, especially the larger of two gametes produced by an oogamous species.
- A system of sexual reproduction in which one gamete (called the egg) is large and nonmotile, while the other (called the sperm) is small and motile. Oogamy is a type of heterogamy. Compare isogamy.