Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia, Wikipedia.


 [o´vah] (L.)
plural of ovum.


Plural of ovum.


(o´vah) plural of ovum.


Plural of ovum.


See ovum.


Plural of ovum.


Plural of ovum.


(o'vum) plural.ova [L., egg]
1. The female reproductive or germ cell.
2. A cell that is capable of developing into a new organism of the same species. Usually fertilization by a spermatozoon is necessary, although in some lower animals ova develop without fertilization (parthenogenesis). See: conception; fertilization; menstrual cycle; menstruation

alecithal ovum

An ovum with a small yolk portion that is distributed throughout the protoplasm. Synonym: isolecithal ovum

centrolecithal ovum

An ovum having a large central food yolk, as in a bird's egg.

holoblastic ovum

An ovum that undergoes complete cleavage, as opposed to partial or meroblastic cleavage.
Enlarge picture

human ovum

The female gamete, required for reproduction. The ovum develops from an oogonium within the graafian follicle of the ovary and matures through the meiotic process of oogenesis. A mature ovum is about 0.13 to 0.14 mm (0.0051 to 0.0055 in) in diameter. At ovulation, the ovum is bounded by a translucent cellular membrane (the zona pellucida), which is connected to a layer of follicular cells (the corona radiata); these cells enclose the cytoplasm, nuclei, and chromatin material. The exact time during which a human ovum is capable of fertilization and further development before degenerating is not known; however, it is probably 24 hr. See: illustration; oogenesis; ovulation

isolecithal ovum

Alecithal ovum.

mature ovum

A secondary oocyte that has completed its second meiotic division as a result of contact with a sperm. The nucleus of the mature ovum becomes the female pronucleus.

meroblastic ovum

An ovum in which only the protoplasmic region undergoes cleavage, characteristic in ova containing a large amount of yolk.

permanent ovum

An ovum ready for fertilization.

primordial ovum

A germ cell that arises very early in the development of the embryo, usually in the yolk sac endoderm, migrates into the urogenital ridge, and is the precursor for the functional gamete.

telolecithal ovum

An ovum in which the yolk is fairly abundant and tends to concentrate in one hemisphere.


Mentioned in: Stool O & P Test


plural of ovum.

Patient discussion about ova

Q. Is there any difference between brown eggs and white eggs? My fitness instructor suggested me to have brown eggs instead of white eggs so is there any difference between brown eggs and white eggs?

A. I have to agree with you. Never heard of any difference between the two and it doesnt sound reasonable that one is better to your health than the other...

Q. why the renal doctor told my husband that he needs to eat a dozen of egg a week for protein,how it will help? it won`t afect his cholesterol,also i would like to know what role the protein plays on his treatment and what other foot its rich in protein that he can can take,without causing problems to his health.

A. if i understand correctly, your husband is diabetic. like my grandfather he probably developed a "Diabetic nephropathy" which is a long name to: kidney being destroyed because of blood vessels clotted by diabetes. because of that destruction the kidneys allow protein to go out in the urine. this is a dangerous situation,a protein in the name of "albomin" helps our blood to hold fluids in blood vessels. without it fluid will leave the blood and go to our organs. not a good situation. so he needs a lot of proteins.
here is a list of a 100 protein rich foods:

Q. How can I catch Salmonella? Yesterday I ate a mousse which was made from raw eggs. Could I have caught Salmonella?

A. Salmonella infections usually resolve in 5-7 days and often do not require treatment unless the patient becomes severely dehydrated or the infection spreads from the intestines. Persons with severe diarrhea may require rehydration, often with intravenous fluids (IV). Antibiotics are not usually necessary unless the infection spreads from the intestines.

More discussions about ova
References in periodicals archive ?
However, the lack of standardization of measurement metrics offered by OVA platforms, coupled with the diversity of devices and video formats, has led to confusion in the market and prevented these solutions from going mainstream.
OvaXon is developing applications to advance animal breeding, will license its technology to Trans Ova.
The university also succeeded in creating cloned ES cells using monkey ova in 2007.
Splenocytes isolated from each group were either left unstimulated or re-stimulated with OVA for 96 h to induce antigen-specific cytokine production.
We combined daily ETS exposure of pregnant BALB/c mice with postnatal OVA inhalation to test the hypothesis that in utero ETS exposure can alter postnatal respiratory and immune responses to non-tobacco allergens.
In all cases, knowing that stool or urine examination shows ova is valuable because repeat examination at 4 to 6 weeks can be used to monitor treatment response.
The fertility of ova will be about 90 percent maintained throughout the freezing and defrosting," Netsu writes on his Web site.
Ova identified as Toxocara were recovered from three parks located in two Residential zones with high prevalence in the Western (54%), followed by southern (46%) zones respectively (Table 1).
A committee of the former Health and Welfare Ministry in December compiled a report proposing that close relatives be allowed to provide sperm or ova in fertility treatment.
But by the mid-1980S, babies were being born via donated eggs that were fertilized outside the womb and later implanted in women incapable of producing viable ova.
Exposure to CAPs alone or after sensitization with OVA produced significant changes in NE concentrations in the PVN (Figure 1).
The Justice Ministry's move is in line with a report compiled by a committee of the former Health and Welfare Ministry in December, proposing that close relatives be allowed to provide sperm or ova in fertility treatment.