| impact | 1. Contact or impression by touch; collision; forcible contact; force communicated. "The quarrel, by that impact driven." (Southey) 2. <mechanics> The single instantaneous stroke of a body in motion against another either in motion or at rest. Source: Websters Dictionary (01 Mar 1998) |
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| impact fusion | <radiobiology> Fusion approach where a fuel projectile is acclerated and impacted into either a stationary target or another projectile. This is valuable for scientific purposes but not a candidate for a fusion energy source because the likelihood of fusion occurring in a single collision is too low. Multiple accelerated pellets colliding with spherical symmetry might be a viable inertial confinement approach. An impact fusion driver accelerates the macroparticles and is used in inertial confinement fusion. (13 Nov 1997) |
| impact resistance | The ability of a lens for eyewear to withstand impact without shattering or breaking, i.e., of a 3/8 -inch steel ball dropped 50 feet; criteria for determination of impact resistance are specified by U.S. Regulations. (05 Mar 2000) |
| impacted | Driven together or close. <surgery> Impacted fracture, a fracture in which the fragments are driven into each other so as to be immovable. Source: Websters Dictionary (01 Mar 1998) |
| impacted foetus | A foetus which, because of its large size or narrowing of the pelvic canal, has become wedged and incapable of spontaneous advance or recession. (05 Mar 2000) |
| impacted fracture | A fracture in which one of the fragments is driven into the cancellous tissue of the other fragment. (05 Mar 2000) |
| impacted teeth | <dentistry> Teeth that have not fully erupted into their normal position. (15 Nov 1997) |
| impacted tooth | <dentistry> A tooth which is within the alveolus (the tooth socket within the alveolar bone of the jaw) and is prevented from erupting into its normal position. (27 Sep 1997) |
| impaction | 1. <surgery> The driving of one fragment of bone into another so that the fragments are not movable upon each other; as, impaction of the skull or of the hip. 2. <medicine> An immovable packing;, a lodgment of something in a strait or passage of the body; as, impaction of the foetal head in the strait of the pelvis; impaction of food or feces in the intestines of man or beast. Origin: L. Impactio a striking: cf. F. Impaction. Source: Websters Dictionary (01 Mar 1998) |
| impaction, dental | Teeth pressing together. For example, molar teeth (the large teeth in the back of the jaw) can be impacted, cause pain and require pain medication, antibiotics, and surgical removal. (12 Dec 1998) |
| sickness impact profile | A quality-of-life scale developed in the united states in 1972 as a measure of health status or dysfunction generated by a disease. It is a behaviourally based questionnaire for patients and addresses activities such as sleep and rest, mobility, recreation, home management, emotional behaviour, social interaction, and the like. It measures the patient's perceived health status and is sensitive enough to detect changes or differences in health status occurring over time or between groups. (12 Dec 1998) |
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| draft environmental impact statement | (DEIS) A draft statement of environmental effects. Section 102 of the National Environmental Policy Act requires a DEIS for all major federal actions. The DEIS is released to the public and other agencies for comment and review. (05 Dec 1998) |
| environmental impact statement | (EIS; FEIS) A statement of the environmental effects of a proposed action and of alternative actions. Section 102 of the National Environmental Policy Act (NEPA) requires an EIS for all major federal actions. (05 Dec 1998) |