单词 | ovum |
释义 | ovumn. 1. a. Biology. The egg of a bird, fish, insect, etc.; the female gamete or reproductive cell in animals, usually produced by an ovary and capable of developing into a new individual (after, or in some cases without, fertilization by the male sperm); an egg cell. Also: (with reference to the work of K. E. von Baer) a Graafian follicle (now historical); a secondary oocyte (immature egg cell); a blastocyst. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid ovum1672 ovulum1698 ovule1762 ovigerm1851 ovicell1869 oosphere1875 ootid1898 1672 Philos. Trans. (Royal Soc.) 7 4018 What the Inquisitive Kerkringius hath discoursed of, concerning Ovaria and Ova in all sorts of Femals. 1691 Philos. Trans. (Royal Soc.) 16 482 If they should impregnate the Ova in the Ovary it self, the Fœtus would increase so fast, that the Ova could not pass down the Tubæ Uteri. 1706 Phillips's New World of Words (new ed.) Ovum, an Egg; also the Spawn of Fish. 1707 Philos. Trans. 1706–7 (Royal Soc.) 25 2320 I concluded that the Bag was nothing but the Membrane of the Ovarium covering the Ova. 1784 J. Twamley Dairying Exemplified 129 By burning the Moss, you destroy at the same time, the Ovas or Eggs, the Chrysalis and grubs. 1793 M. Baillie Morbid Anat. xxi. 274 This arises from the ovum being stopped in its progress from the ovarium to the uterus. 1838 Philos. Trans. (Royal Soc.) 128 301 (note) Professor Baer called the vesicle he discovered in the ovary, not the ovum but the ‘ovulum’. 1861 J. R. Greene Man. Animal Kingdom II. 14 True reproduction, by contact of ova and spermatozoa. 1879 Cassell's Techn. Educator (new ed.) IV. 154/1 The number of germs or ova brought forth by a single mature oyster exceeds one million. 1898 P. Manson Trop. Dis. 414 Because leprosy is common in the descendants and blood collaterals of lepers, this is no proof of ovum infection. 1937 Life 13 Sept. 56/3 Identical twins who develop from the same ovum and hence look alike, snubbed nonidentical twins who develop from two ova. 1985 M. F. Myles Textbk. Midwives (ed. 10) iv. 53 The ovum is the term used during the first three weeks for the whole structure, including the sac. 1990 L. H. Tribe Abortion 123 Some experts estimate that fully two-thirds of all fertilized ova fail naturally to implant in the uterus. ΘΚΠ the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > [noun] > parts of > ovule ovum1703 ovulum1786 ovule1800 nucellus1882 1703 Philos. Trans. 1702–3 (Royal Soc.) 23 1475 The Stylus..is a Tube design'd to convey these Seminal Plants into their Nest in the Ova. 1760 J. Lee Introd. Bot. ii. xx. 117 When the Ova are hatched, the Cotyledons preserve the Form of the halved Seed. 1866 J. Lindley & T. Moore Treasury Bot. II. 829/2 Ovule, Ovum, the young seed. c. Botany. The female gamete or egg cell of a plant, esp. of an oogamous alga. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > gametes gamete1878 zoogamete1879 planogamete1880 macrogamete1888 microgamete1888 isogamete1891 megagamete1891 oogamete1891 progamete1892 heterogamete1897 ovum1900 non-crossover1914 merogamete1925 hologamete1926 anisogamete- 1900 B. D. Jackson Gloss. Bot. Terms 176/1 Oosphere, a naked and nucleate mass of protoplasm, which, after coalescence with the sperm-nucleus, develops into an oosperm; the egg or ovum. 1927 F. E. Fritsch G. S. West's Brit. Freshwater Algae (rev. ed.) 45 The female [sexual organ] or oogonium..invariably develops but a single ovum..while the male or antheridium gives rise to any number of male cells. 1946 A. Nelson Princ. Agric. Bot. vii. 163 At the end of the sac nearest the micropyle lie three nuclei... One of these is the all-important megagamete or ovum; the other two..are called the ‘help-cells’ or synergids. 1987 R. L. Fletcher Seaweeds Brit. Isles III. i. 37 In oogamous reproduction, the female gametes (termed oospores, ova or eggs) are usually produced singly (except in fucoids) in specialised oogonia. ΘΚΠ society > leisure > the arts > visual arts > ornamental art and craft > pattern or design > [noun] > others popinjay1322 serpent1388 moss-work1600 flame1602 frostwork1631 damask branch1634 mascaron1664 lacework1675 swash1680 branch-work1702 escallop-shella1706 festoon work1712 ovum1728 bricking1760 rising sun1787 ram's horn1842 linen-pattern1845 linen-scroll1854 wheel-rood1862 primal1875 patch ornament1878 tree1879 wheel-cross1882 skeuomorph1889 linenfold1891 taotie1915 boteh1917 pelta1935 starburst1953 quilling1972 towel-pattern- 1728 E. Chambers Cycl. Ova, in Architecture, are Ornaments in form of Eggs, carved on the Contour of the Ovolo, or Quarter-round; and separated from each other by Anchors or Arrows Heads. 1823 P. Nicholson New Pract. Builder Gloss. 589/1 Ova, an ornament in form of an egg. 1842 J. Gwilt Encycl. Archit. 1011 Ova, ornaments in the shape of an egg, into which the echinus or ovolo is often carved. 1851 E. J. Millington tr. A. N. Didron Christian Iconogr. I. 316 Immediately below the ovæ of the cornice. Compounds C1. With the plural ova. a. ova-bearing adj. ΚΠ 1846 J. D. Dana U.S. Exploring Exped.: Zoophytes v. §85. 87 The distinction in plants of budding and ova-bearing individuals. 1994 Dis. Aquatic Organisms 20 59 Some neoplastic cells in follicles adjacent to normal ova-bearing follicles were differentiating into spermatocytes. ova-containing adj. ΚΠ 1904 N.E.D. at Ovum Often with the pl., as ova-bearing, -containing adjs. ova-hatching adj. ΚΠ 1904 N.E.D. at Ovum Often with the pl., as ova-bearing.., -hatching. b. ΚΠ 1781 Philos. Trans. (Royal Soc.) 71 172 Two ovaria, in each of which are many hundred ova-ducts. 1865 S. Pancoast Ladies' Med. Guide 71 The Fallopian tubes or ovaducts are equally developed on both sides of the body. C2. ΚΠ 1883 Encycl. Brit. XVI. 843/2 The genealogical individual of Gallesio and Huxley..may be designated with Haeckel the ovum-product or ovum-cycle. ΚΠ 1883 Encycl. Brit. XVI. 843/2 The genealogical individual of Gallesio and Huxley..may be designated with Haeckel the ovum-product or ovum-cycle. This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022). < n.1672 |
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