noun Cell Biology.

  1. one of a pair of structurally dissimilar gametes, the female gamete being large and nonmotile and the male gamete being small and motile.


  1. Characterized by or having small motile male gametes and large nonmotile female gametes.


  1. A female gamete, especially the larger of two gametes produced by an oogamous species.

  1. 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.
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