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nounthe female reproductive cell; the female gamete
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Definition that contains ovum
- egg 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
- harvey English physician and scientist who described the circulation of the blood; he later proposed that all animals originate from an ovum produced by the female of the species (1578-1657)
- identical (of twins) derived from a single egg or ovum
- conception the act of becoming pregnant; fertilization of an ovum by a spermatozoon
- cleavage (embryology) the repeated division of a fertilised ovum
- yolk nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg)
- ovulation the expulsion of an ovum from the ovary (usually midway in the menstrual cycle)
- segmentation (embryology) the repeated division of a fertilised ovum
- zygote (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell)
- blastula early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs