ovum - the female reproductive cell; the female gameteegg - animal reproductive body consisting of an ovum or embryo together with nutritive and protective envelopes; especially the thin-shelled reproductive body laid by e.g. female birds gamete - a mature sexual reproductive cell having a single set of unpaired chromosomes ootid - mature ovum after penetration by sperm but before the formation of a zygote ovule - a small or immature ovum |