| dynamic force | <radiobiology> Typically defined as the ability to do work. Power is the rate at which work is done, or the rate at which energy is changed. Work characterises the degree to which the properties of a substance are transformed. Energy exists in many forms, which can be converted from one to another in various ways. Examples include: gravitational energy, electrical energy, magnetic and electric field energy, atomic binding energy (a form of electrical energy really), nuclear binding energy, chemical energy (another form of electrical energy), in addition to these forms of potential energy there are also kinetic energy (energy due to motion), and thermal energy (heat, a form of kinetic energy where the motion is due to thermal vibrations/motions), and so on. (09 Oct 1997) |
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| dynamic friction | The force that must be overcome to maintain steady motion of one body relative to another because they remain in contact. Compare: starting friction. (05 Mar 2000) |
| dynamic ileus | Intestinal obstruction due to spastic contraction of a segment of the bowel. Synonym: spastic ileus. (05 Mar 2000) |
| dynamic murmur | A heart murmur due to anaemia or to any cause other than a valvular lesion. (05 Mar 2000) |
| dynamic platform posturography | A force platform that evaluates somatosensory and visual influences on posture and equilibrium. Synonym: dynamic platform posturography. Origin: posture + G. Grapho, to write (05 Mar 2000) |
| dynamic psychiatry | Psychiatric theory and practice emphasizing the principles of psychoanalysis. Synonym: analytic psychiatry, dynamic psychiatry. (05 Mar 2000) |
| dynamic psychology | A psychologic approach that concerns itself with the causes of behaviour. (05 Mar 2000) |
| dynamic psychotherapy | Psychotherapy utilizing freudian principles. See: psychoanalysis. Synonym: dynamic psychotherapy. (05 Mar 2000) |
| dynamic range | <microscopy> In video and other electronic equipment and in photographic emulsions, the ratio of the maximum to minimum signal levels that introduce no more than acceptable levels of signal amplitude distortions. (05 Aug 1998) |
| dynamic refraction | Refraction of the eye during accommodation. (05 Mar 2000) |
| dynamic relations | Relative movements between two objects, e.g., the relationship of the mandible to the maxillae. (05 Mar 2000) |
| dynamic school | A group of theorists founded by Stahl, who professed the belief that all vital action is the result of an internal force independent of anything external to the body. (05 Mar 2000) |
| dynamic splint | A splint utilizing springs or elastic bands that aids in movements initiated by the patient by controlling the plane and range of motion. Synonym: active splint, functional splint. (05 Mar 2000) |
| dynamic viscosity | The internal or molecular frictional resistance of a fluid by Newton's law of viscosity as the ratio of the applied force per unit area to the relative velocity of adjacent fluid layers (produced by the force). (05 Mar 2000) |
| dynamical | 1. Of or pertaining to dynamics; belonging to energy or power; characterised by energy or production of force. "Science, as well as history, has its past to show, a past indeed, much larger; but its immensity is dynamic, not divine." (J. Martineau) "The vowel is produced by phonetic, not by dynamic, causes." (J. Peile) 2. Relating to physical forces, effects, or laws; as, dynamical geology. "As natural science has become more dynamic, so has history." (Prof. Shedd) Dynamical electricity. See Electricity. Origin: Gr. Powerful, fr. Power, fr. To be able; cf. L. Durus hard, E. Dure: cf. F. Dynamique. Source: Websters Dictionary (01 Mar 1998) |