| Moore's lightning streaks | Photopsia manifested by vertical flashes of light, seen usually on the temporal side of the affected eye, caused by the involutional shrinkage of vitreous humor. (05 Mar 2000) |
|---|---|
| lightning | 1. A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder. 2. The act of making bright, or the state of being made bright; enlightenment; brightening, as of the mental powers. Ball lightning, a rare form of lightning sometimes seen as a globe of fire moving from the clouds to the earth. Chain lightning, lightning in angular, zigzag, or forked flashes. Heat lightning, more or less vivid and extensive flashes of electric light, without thunder, seen near the horizon, especially. at the close of a hot day. Lightning arrester, a luminous beetle. See Firefly. Lightning conductor, a lightning rod. Lightning glance, a quick, penetrating glance of a brilliant eye. Lightning rod, a metallic rod set up on a building, or on the mast of a vessel, and connected with the earth or water below, for the purpose of protecting the building or vessel from lightning. Sheet lightning, a diffused glow of electric light flashing out from the clouds, and illumining their outlines. The appearance is sometimes due to the reflection of light from distant flashes of lightning by the nearer clouds. Origin: For lightening, fr. Lighten to flash. Source: Websters Dictionary (01 Mar 1998) |
| lightning injuries | Accidental injuries caused by brief high-voltage electrical discharges during thunderstorms. Cardiopulmonary arrest, coma and other neurologic symptoms, myocardial necrosis, and dermal burns are common. Prompt treatment of the acute sequelae, including cardiopulmonary resuscitation, is indicated for survival. (12 Dec 1998) |
| lightning strip | A strip of metal with abrasive on one side, used to open rough or improper contacts of proximal restorations. (05 Mar 2000) |
| cumulative effects | Effects on the environment resulting from actions that are individually minor but that add up to a greater total effect as they take place over a period of time. (05 Dec 1998) |
| prenatal exposure delayed effects | Delayed effects on offspring of maternal or foetal prenatal exposure to drugs, radiation and other physical agents, manipulation, nutrition, stress, etc. (12 Dec 1998) |
| side effects | Problems that occur when treatment affects healthy cells. Common side effects of cancer treatment are fatigue, nausea, vomiting, decreased blood cell counts, hair loss, and mouth sores. (12 Dec 1998) |
| diamagnetic effects | <radiobiology> Application of a magnetic field to a plasma will tend to create circulating current within the plasma that will reduce the strength of the magnetic field. (09 Oct 1997) |
| experimenter effects | The influence of the experimenter's behaviour, personality traits, or expectancies on the results of that person's own research. See: double blind study. (05 Mar 2000) |
| foetal alcohol effects | A softer diagnosis than foetal alcohol syndrome (FAS). The diagnosis of possible FAE is considered when: 1. The person has some signs of FAS; 2. The person does not meet all of the necessary criteria for FAS; and 3. There is a history of alcohol exposure before birth. (12 Dec 1998) |