from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The female reproductive cell or gamete of animals; egg.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The female gamete in animals; the egg cell.
from the GNU version of the Collaborative International Dictionary of English
- n. 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. See Illust. of mycropyle.
- n. One of the series of egg-shaped ornaments into which the ovolo is often carved.
from The Century Dictionary and Cyclopedia
- n. An egg, in a broad biological sense; the proper product of an ovary; the female germ or seed, which when fertilized by the male sperm, and sometimes without such fecundation, is capable of developing into an individual like the parent.
- n. [capitalized] In conchology, same as Ovulum.
- n. [capitalized] In ichthyology, a genus of fishes.
- n. In architecture, an ornament in the shape of an egg.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the female reproductive cell; the female gamete
The first stage in the development of any animal is the tiny speck of plasm, hardly visible to the naked eye, which we call the ovum, or egg-cell.
You and Marshall have a legitimate dispute as to whether an unimplanted but fertilized ovum is a human being deserving equal protection of law.
Basically, this means that ethical concerns about "destroying an embryo" for raw stem cell materials are obviated, since a parthenogenic ovum is not viable -- and furthermore, the elimination of an unfertilized egg every 28 days or so is noncontroversial, so presumbaly "rescuing" eggs before they're flushed will be similarily morally unambiguous.
For Harvey, as every student of his works knows, believed in equivocal generation; and, in the sense in which he uses the word ovum,
Man is developed from a small cell called the ovum or ovule, about the 120th of an inch in diameter, which differs in no apparent respect from the ovules from which other animals grow.
The former is incorrectly termed ovum, for it merely corresponds to what in well-fed sanguineous animals is fat; and thus it is that it makes its appearance in Testacea at those seasons of the year when they are in good condition, namely, spring and autumn.
Oysters also have a so-called ovum, corresponding in character to that of the sea-urchins, but existing only on one side of their body.
For in all these animals the head is central, but in the sea-urchin the so-called ovum is above [and symmetrical, while in the oyster it is only one side].
This mecon in the turbinated genera is lodged in the spiral part of the shell, while in univalves, such as limpets, it occupies the fundus, and in bivalves is placed near the hinge, the so-called ovum lying on the right; while on the opposite side is the vent.
(In animals the female reproductive cell is called ovum, plural ova.)