| oo | 1. <ornithology> A beautiful bird (Moho nobilis) of the Hawaiian Islands. It yields the brilliant yellow feathers formerly used in making the royal robes. Synonym: yellow-tufted honeysucker. Origin: Hawaiian. 2. <prefix> Meaning egg or ovary. See: oophor-, ovario-, ovi-, ovo-. Origin: G. Oon, egg. OO- Source: Websters Dictionary (21 Jun 2000) |
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| oocyesis | Development of an impregnated ovum in an ovarian follicle. See: Spiegelberg's criteria. Synonym: oocyesis, ovariocyesis. (05 Mar 2000) |
| oocyst | <embryology> The encysted form of the fertilised macrogamete, or zygote, in coccidian Sporozoea in which sporogonic multiplication occurs. This results in the formation of sporozoites, infectious agents for the next stage of the sporozoan life cycle. Origin: G. Oon, egg, + kystis, bladder (05 Mar 2000) |
| oocyte | The developing female gamete before completion and release. The female germ cells in stages between the prophase of the first maturation division and the completion of the second maturation division. (21 Jun 2000) |
| oocyte donation | <gynaecology> Transfer of egg cell from donor to host mother. Oocytes are captured by laparoscopy, fertilised in vitro, and transferred to the recipient. Used for women with premature ovarian failure or severe genetic disorders, women who respond poorly to human menopausal gonadotropin, and women older than 40 years who do not conceive with use of other therapies. (21 Jun 2000) |
| oocyte expression | <molecular biology> Technique whereby the cellular machinery of an oocyte (typically that of Xenopus) is utilised to transcribe functional protein from microinjected RNA. (18 Nov 1997) |
| ooecium | <zoology> One of the special zooids, or cells, of Bryozoa, destined to receive and develop ova; an ovicell. See Bryozoa. Origin: NL, fr. Gr. An egg + a house. Source: Websters Dictionary (01 Mar 1998) |
| oogamy | A condition where the gametes of a species are fully differentiated sexually into a tiny and highly mobile male gamete (called a sperm) and a large, nonmoving female gamete (called an egg). (09 Oct 1997) |
| oogenesis | The process of egg formation. (18 Nov 1997) |
| oogenetic | Producing ova. Synonym: oogenic, oogenous, ovigenetic, ovigenic, ovigenous. (05 Mar 2000) |
| oogenic | Producing ova. Synonym: oogenic, oogenous, ovigenetic, ovigenic, ovigenous. (05 Mar 2000) |
| oogonia | The primitive differentiated female gametes which give rise to oocytes. (12 Dec 1998) |
| oogonium | Female sexual structure in certain algae and fungi, containing one or more gametes. After fertilization the oogonium contains the oospore. (18 Nov 1997) |
| ooidal | <biology> Shaped like an egg. Source: Websters Dictionary (01 Mar 1998) |
| ookinesis | Chromosomal movements of the egg during maturation and fertilization. Origin: G. Oon, egg, + kinesis, movement (05 Mar 2000) |