| P-VEP | pattern visual evoked potential |
|---|---|
| PVF | peripheral visual field; portal venous flow; primary ventricular fibrillation |
| RVF | renal vascular failure; Rift Valley fever; right ventricular failure; right visual field |
| RVS | rectovaginal space; relative value scale/study; reported visual sensation; retrovaginal space |
| STVS | short-term visual storage |
| secondary refractory anaemia | Any persistent anaemia that is successfully treated only by blood transfusions, and that is associated with another condition. (05 Mar 2000) |
|---|---|
| secondary reinforcement | Reinforcement through something which, while it does not satisfy the need directly, has been associated with direct satisfaction of the need, such as the effect on behaviour of a food or beer commercial on television. (05 Mar 2000) |
| secondary renal calculus | A calculus associated with infection and/or obstruction, usually composed of struvite (magnesium ammonium phosphate). Synonym: infection calculus. (05 Mar 2000) |
| secondary renal tubular acidosis | Renal tubular acidosis that may occur as a complication of hypercalcaemic states, hyperglobulinaemic disorders, and in some other chronic renal conditions; a regular component of De Toni-Fanconi syndrome. (05 Mar 2000) |
| secondary retinitis | Retinitis that follows uveal inflammation. (05 Mar 2000) |
| secondary saturation | A technique of nitrous oxide anaesthesia consisting of an abrupt curtailment of the oxygen in the inhaled mixture to produce a deep plane of anaesthesia, following which oxygen is administered to correct hypoxia. (05 Mar 2000) |
| secondary screw-worm | An accidental or facultative screw-worm that enters a prior wound or suppurated condition and feeds on infected rather than intact tissues. Many blowflies are included, such as Calliphora vicina, Phaenicia sericata, Phormia regina, Cochliomyia macellaria, Chrysomyia species, and other fleshflies. (05 Mar 2000) |
| secondary sensory nuclei | Nuclei terminales, collective term indicating those nerve cell groups in the rhombencephalon and spinal cord in which the afferent fibres of the spinal and cranial nerves terminate. Synonym: nuclei terminationis, secondary sensory nuclei. (05 Mar 2000) |
| secondary sex characters | Those character's peculiar to the male or female that develop at puberty, e.g., the beard of men and the breasts of women. (05 Mar 2000) |
| secondary site | A second site in which cancer is found. Example: cancer in the lymph nodes near the breast is a secondary site. (09 Oct 1997) |
| secondary spiral lamina | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary spiral plate | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary structure | <molecular biology> Structures produced in polypeptide chains involving interactions between amino acids within the chain. Especially _ helical and _ pleated sheet structures. Also applies to the complex folding of nucleic acids as, for example: the clover leaf structure of tRNA. (18 Nov 1997) |
| secondary succession | The progression of plant communities following disturbances such as fire, windthrow and timber harvesting. See Succession. (05 Dec 1998) |
| secondary suture | Delayed closure of a wound. (05 Mar 2000) |