OVUM • FREE TRANSLATOR.ORG • Definition of Ovum

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/ˈoʊvəm/ Listen

noun

Ovum n. (pl. L. ova, E. ovums)

(Biol.) A more or less spherical and transparent cell, which by a process of multiplication and growth develops into a mass of cells, constituting a new individual like the parent; an egg, spore, germ, or germ cell. Note: The ovum is a typical cell, with a cell wall, cell substance, nucleus, and nucleolus. In man and the higher animals the cell wall, a vertically striated membrane, is called the zona pellucida; the cell contents, the vitellus; the nucleus, the germinal vesicle; and the nucleolus, the germinal spot. The diameter of the ripe ovum in man and the domestic animals varies between 1-200 and 1-120 of an inch.

(Arch.) One of the series of egg-shaped ornaments into which the ovolo is often carved.

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Etymology of 'Ovum'

Collaborative International Dictionary of English 0.48

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"Ovum" Quotes from Famous Books

... octogenarian may claim personal identity with the infant, the infant may certainly do so with the impregnate ovum from which it has developed. If so, the octogenarian will prove to have been a fish once in this his present life. This is as certain as that he was living yesterday, and stands on exactly the ...

— Unconscious Memory • Samuel Butler

... because the fate of the children, who do not receive proper care and nursing, is a sad one. In the case of married couples, on the other hand, it becomes a sacred duty to indulge one's desires. This is proved, among other things, by the fact that the law protects even the female ovum, and it is right ...

— Married • August Strindberg

... month, a mere fraction of its course. There is indeed a remarkably rapid change of forms in such an embryo at first: the rapidity, says Professor Owen, is 'in proportion to the proximity of the ovum to the commencement of its development;' and, conformable to this fact, we find the same zoologist stating that, in the lowest division of the animal kingdom, (the Acrita of his arrangement,) there is a much quicker advance of forms towards the next above it, ...

— An Expository Outline of the "Vestiges of the Natural History of Creation" • Anonymous

... features of interest, and cannot fail to retain its importance as an introduction to the study of embryology. The four principal phases in the development are: (1) Blastula, (2) Gastrula, (3) Flagellate Embryo, (4) Larva. The segmentation or cleavage of the ovum which follows upon fertilization terminates in the achievement of the blastula form, a minute sphere of cells surrounding a central cavity. Then follows the phenomenon of gastrulation, by which one-half of the blastula is invaginated into the other, so as to obliterate the segmentation cavity. The ...

— Project Gutenberg Encyclopedia

... the types of structure which are permanent in the lower forms of animal life. Thus, in the zoological chain, there are beings of all grades, from the most simple in structure to the most complex; and the most complex animal, in its development from the ovum or egg, passes through all these grades of structure, ending in that which is above all, and distinctively its own. 'Without going into tedious details, man presents, as regards the most important of his constituent structures, his nervous system, the successive characteristics of an avertebrated ...

— The Continental Monthly, Vol. 3, No. 1 January 1863 - Devoted To Literature And National Policy • Various

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