Slowness or limitation of development.
- intrauterine growth r. SYN: fetal growth restriction.
- mental r. subaverage general intellectual functioning that originates during the developmental period and is associated with impairment in adaptive behavior. The American Association on Mental Deficiency lists eight medical classifications and five psychologic classifications; the latter five replace the three former classifications of moron, imbecile, and idiot. Mental r. classification requires assignment of an index for performance relative to a person's peers on two interrelated criteria: measured intelligence (IQ) and overall socioadaptive behavior (a judgmental rating of the individual's relative level of performance in school, at work, at home, and in the community). In general an IQ of 70 or below indicates mental r. (mild = 50/55–70; moderate = 35/40–50/55; severe = 20/25–35/40; profound = below 20/25); an IQ of 70–85 signifies borderline intellectual functioning. SYN: amentia (1), mental deficiency, oligophrenia.
- psychomotor r. slowed psychic activity or motor activity, or both.
- viscoelastic r. a technique for the measurement of the molecular weight of large DNA molecules; the DNA is stretched by hydrodynamic shear forces and, when the molecules relax, the relaxation time is measured.

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re·tar·da·tion .rē-.tär-'dā-shən, ri- n
1) an abnormal slowness of thought or action esp mental retardation
2) slowness in development or progress

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the slowing up of a process. Psychomotor retardation is a marked slowing down of activity and speech, which can reach a degree where a patient can no longer care for himself. It is a symptom of severe depression. The term mental retardation implies a delay in intellectual development rather than a qualitative defect.

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re·tar·da·tion (re″tahr-daґshən) [L. retardare to slow down, impede] delay; hindrance; delayed development.

Medical dictionary. 2011.

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  • Retardation — Re tar*da tion, n. [L. retardatio: cf. F. retardation.] 1. The act of retarding; hindrance; the act of delaying; as, the retardation of the motion of a ship; opposed to {acceleration}. [1913 Webster] The retardations of our fluent motion. De… …   The Collaborative International Dictionary of English

  • Retardation — may have different meanings: * Mental retardation * Negative acceleration in mechanics (i.e. rate of decrease of velocity) * Retardation Factor, in the Advection/Dispersion transport equation (ADE) * Retarded potential in electrodynamics …   Wikipedia

  • retardation — [rē΄tär dā′shən] n. [ME < L retardatio] 1. a retarding or being retarded 2. something that retards; hindrance 3. short for MENTAL RETARDATION 4. a decrease in velocity 5. the amount that something is retarded retardative …   English World dictionary

  • retardation — retardation. См. ретардация. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Retardation — (lat., »Verzögerung«), in der Physik die Verminderung der Geschwindigkeit eines bewegten Körpers (s. Beschleunigung); in der Musik soviel wie vorbereitete Dissonanz, Vorhalt (s. d.) …   Meyers Großes Konversations-Lexikon

  • Retardation — Retardatiōn (lat.), Verzögerung, Hemmung; in der Musik: Vorhalt (s.d.); retardieren, aufhalten, verzögern …   Kleines Konversations-Lexikon

  • retardation — index check (bar), damper (stopper), delay, deterrent, disadvantage, encumbrance, filibuster …   Law dictionary

  • retardation — [ʀ(ə)taʀdɑsjɔ̃] n. f. ÉTYM. 1748; « retard », 1396; « obstacle », déb. XIVe; de retarder. ❖ ♦ Didact. Accélération négative, décélération …   Encyclopédie Universelle

  • Retardation — Retardation,die:⇨Verzögerung(1) …   Das Wörterbuch der Synonyme

  • retardation — (n.) early 15c., fact or action of making slower in movement or time, from L. retardationem, from retardare to make slow, delay, keep back, hinder, from re , intensive prefix, + tardare to slow (see TARDY (Cf. tardy)) …   Etymology dictionary

  • Retardation — (körperliche oder geistige) Reifungsverzögerung * * * Re|tar|da|ti|on 〈f. 20〉 1. 〈geh.〉 Verzögerung, Verlangsamung 2. 〈Mus.〉 Verzögerung der oberen Stimme gegenüber der unteren ● Retardation in der Entwicklung 〈Biol.〉 [<lat. retardatio… …   Universal-Lexikon

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