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Ovum   Listen
noun
Ovum  n.  (pl. L. ova, E. ovums)  
1.
(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.
2.
(Arch.) One of the series of egg-shaped ornaments into which the ovolo is often carved.






Collaborative International Dictionary of English 0.48








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"Ovum" Quotes from Famous Books



... development of any vertebrate from the ovum or minute embryonic egg affords one of the most marvellous chapters in Natural History. We see the contents of the ovum undergoing numerous definite changes, its interior dividing and subdividing till it consists of a mass of cells, then a ...
— Darwinism (1889) • Alfred Russel Wallace

... in the female is sometimes caused by a morbid adhesion of the tube to a portion of the ovary. By what power the mouth of the tube is directed toward a particular portion of an ovary from which the ovum is about to be discharged, remains entirely unknown, as does also the precise nature of the cause ...
— Searchlights on Health: Light on Dark Corners • B.G. Jefferis

... interest physiologically, as showing the wide limits of possible variation which thus may even involve the sex, "for an ovule to develop pollen within its interior," says Mr. Salter, "is equivalent to an ovum in an animal being converted into a capsule of spermatozoa. It is a conversion of germ into sperm, the most complete violation of individuality and unity of sex. * * * * The occurrence of an antheroid ovule and a normal ovule on the same carpellary ...
— Vegetable Teratology - An Account of the Principal Deviations from the Usual Construction of Plants • Maxwell T. Masters

... that man's soul is "a volatile odoriferous principle, capable of solution in glycerine". Psychogen is the name he gives to it, and his experiments show that it is present not merely in the body as a whole, but in every individual cell, in the ovum, and even in the ultimate elements of protoplasm. I need hardly say to so intelligent an audience as this, that these highly interesting experiments of Dr. Jaeger are corroborated by many facts, both physiological and psychological, that ...
— The Life of Buddha and Its Lessons • H.S. Olcott

... cerebral deficiency of the pyramidal cells in the brain cortex, they may be produced, and, when once produced, they are reproduced as readily as the perfected structure of the face or eye or brain, if the gametes which contain these potentialities unite to form the ovum. But Nature is not only the producer. Given a fair field and no favour, natural selection would leave no problem of the unfit to perplex the mind of man who looks before and after. This we know cannot be, ...
— The Task of Social Hygiene • Havelock Ellis

... the female parent in viviparous animals to their young progeny may be divided into three kinds, corresponding with the age of the new creature. 1. The nutriment contained in the ovum as previously prepared for the embryon in the ovary. 2. The liquor amnii prepared for the fetus in the uterus, and in which it swims; and lastly, the milk prepared in the pectoral glands for the new born-child. There ...
— Zoonomia, Vol. I - Or, the Laws of Organic Life • Erasmus Darwin

... haec patulum concedit vallis in orbem et sinuata latus resupinis undique silvis inter continuos curvatur concava montes, sic ibi planitiem curvae sinus ambit arenae et geminis medium se molibus alligat ovum. * * * * * balteus en gemmis, en illita porticus auro certatim radiant; nec non, ubi finis arenae proxima marmoreo praebet spectacula muro, sternitur adiunctis ebur admirabile truncis et coit in rotulum, tereti qui lubricus axe impositos subita ...
— Post-Augustan Poetry - From Seneca to Juvenal • H.E. Butler

... libido in the text above, for the libido is always active even when it is directed to a passive aim. The second, the biological significance of masculine and feminine, is the one which permits the clearest determination. Masculine and feminine are here characterized by the presence of semen or ovum and through the functions emanating from them. The activity and its secondary manifestations, like stronger developed muscles, aggression, a greater intensity of libido, are as a rule soldered to the biological masculinity ...
— Three Contributions to the Theory of Sex • Sigmund Freud

... found covered with a crust perfectly resembling the real pearl. Such is one method of getting artificial pearls. The extraneous body which naturally serves for the nucleus, appears to be very often, or, as Sir E. Home says, always, a blighted ovum or egg. This theory which, however, is here but partly explained, has been fully adopted by Sir E. Home:—"if," says the enthusiastic baronet, "I shall prove that this, the richest jewel in a monarch's crown, which cannot be imitated by any art of man, either in the beauty of its form or ...
— The Mirror of Literature, Amusement, and Instruction, Vol. 20, - Issue 570, October 13, 1832 • Various

... at much pains with them: He prevailed so far with Gordon, that he desired to be relaxed from the sentence of excommunication which he was under; and accordingly Mr. Blair did the same: The other two, who were bishops sons, died impenitent.—Mali corvi malum ovum. ...
— Biographia Scoticana (Scots Worthies) • John Howie

... "twins" is a vague expression, which covers two very dissimilar events—the one corresponding to the progeny of animals that usually bear more than one at a birth, each of the progeny being derived from a separate ovum, while the other event is due to the development of two germinal spots in the same ovum. In the latter case they are enveloped in the same membrane, and all such twins are found invariably to be of the same sex. The consequence of this is, that I find a curious discontinuity in my results. ...
— Inquiries into Human Faculty and Its Development • Francis Galton



Words linked to "Ovum" :   egg, egg cell, ovule, gamete, ovulate, ootid



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