| definitive callus | The callus which has become converted into osseous tissue. Synonym: permanent callus. (05 Mar 2000) |
|---|---|
| definitive erythroblast | <haematology, pathology> Embryonic erythroblast found in the liver, smaller than primitive erythroblasts, they lose their nucleus at the end of the maturation cycle and produce erythrocytes with adult haemoglobin. (18 Nov 1997) |
| definitive host | <epidemiology> The host in which a parasite reproduces sexually. (05 Dec 1998) |
| definitive lysosomes | Lysosome's in which lysis takes place, owing to the activity of hydrolytic enzymes; they are believed to eventually become residual bodies. Synonym: definitive lysosomes, digestive vacuole. (05 Mar 2000) |
| definitive method | An analytical procedure for the measurement of a specified analyte in a specified material which is known to give essentially the true value for the concentration of the analyte. (05 Mar 2000) |
| definitive prosthesis | A dental prosthesis to be used over a prescribed period of time. (05 Mar 2000) |
| anovular ovarian follicle | A follicle that does not contain an ovum. (05 Mar 2000) |
| atretic ovarian follicle | A follicle that degenerates before coming to maturity; great numbers of such atretic follicle's occur in the ovary before puberty; in the sexually mature woman, several are formed each month. Synonym: corpus atreticum. (05 Mar 2000) |
| vesicular ovarian follicle | A follicle in which the oocyte attains its full size and is surrounded by an extracellular glycoprotein layer (zona pellucida) that separates it from a peripheral layer of follicular cells permeated by one or more fluid-filled antra; the theca of the follicle develops into internal and external layers. Synonym: folliculus ovaricus vesiculosus, graafian follicle, secondary follicle. (05 Mar 2000) |
| mature ovarian follicle | A follicle ready for ovulation; in the human ovary its antrum attains a diameter of 6 to 8 mm and presents a surface bulge; a first maturation (meiotic) division of the ovum usually occurs just prior to the rupture of the follicle. (05 Mar 2000) |
| Graafian follicle | <gynaecology> Final stage in the differentiation of follicles in the mammalian ovary. Consists of a spherical fluid filled blister on the surface of the ovary that bursts at ovulation to release the oocyte. (18 Nov 1997) |
| granular layer of a vesicular ovarian follicle | The layer of small cells that forms the wall of an ovarian follicle. Synonym: granular layer of a vesicular ovarian follicle, granulosa, membrana granulosa, stratum granulosum ovarii. (05 Mar 2000) |
| growing ovarian follicle | A follicle having several layers of proliferating follicular cells surrounding the ovum, but separated from it by an extracellular glycoprotein layer (zona pellucida). (05 Mar 2000) |
| polyovular ovarian follicle | <gynaecology> A follicle containing more than one ovum. (05 Mar 2000) |
| hair follicle | <dermatology> A tube-like opening in the epidermis where the hair shaft develops and into which the sebaceous glands open (13 Nov 1997) |