| silent mutation | Mutations that have no effect on phenotype because they do not affect the activity of the product of the gene, usually because of codon ambiguity. (18 Nov 1997) |
|---|---|
| silent myocardial infarction | Infarction that produces none of the characteristic symptoms and signs of myocardial infarction. (05 Mar 2000) |
| silent period | The time during which there is no electrical activity in a muscle following its rapid unloading, any pause in an otherwise continuous series of electrophysiologic events. (05 Mar 2000) |
| silenus | <zoology> See Wanderoo. Origin: L. Silenus the tutor and attendant of Bacchus. Source: Websters Dictionary (01 Mar 1998) |
| silex | <chemical> Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic. Origin: L, a finit, a pebblestone. Source: Websters Dictionary (01 Mar 1998) |
| silhouette sign of Felson | In pulmonary radiology, the obliteration of a normal air-soft tissue interface, such as the cardiac silhouette, when fluid fills the adjacent part of the lung. (05 Mar 2000) |
| silica | Fine particulate dust from quartz rock that is known to cause a progressive lung injury over long-term. See: pneumoconiosis. (27 Sep 1997) |
| silica dust | Fine particulate dust from quartz rock that is known to cause a progressive lung injury over long-term. See: pneumoconiosis. (27 Sep 1997) |
| silica granuloma | Eruption of granulomatous lesions due to traumatic inoculation of the skin with sand, or materials that contain silica; this condition may follow dermabrasion using sandpaper technique. (05 Mar 2000) |
| silicate | <chemistry> A salt of silicic acid. In mineralogical chemistry the silicates include; the unisilicates or orthosilicates, salts of orthosilicic acid; the bisilicates or metasilicates, salts of metasilicic acid; the polysilicates or acid silicates, salts of the polysilicic acids; the basic silicates or subsilicates, in which the equivalent of base is greater than would be required to neutralize the acid; and the hydrous silicates, including the zeolites and many hydrated decomposition products. Origin: Cf. F. Silicate. Source: Websters Dictionary (01 Mar 1998) |
| silicate cement | <chemical> A relatively hard, translucent, restorative material used primarily in anterior teeth. Chemical name: Silicic acid, aluminum calcium salt (12 Dec 1998) |
| silicate restorations | Restoration's of lost tooth structure made with silicate cement. (05 Mar 2000) |
| silicated | <chemistry> Combined or impregnated with silicon or silica; as, silicated hydrogen; silicated rocks. Silicated soap, a hard soap containing silicate of soda. Source: Websters Dictionary (01 Mar 1998) |
| silicates | The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (12 Dec 1998) |
| silicatosis | Inflammation of the lung caused by foreign bodies (inhaled particles of silica): leads to fibrosis but unlike asbestosis does not predispose to neoplasia. (18 Nov 1997) |