A change from the normal size or shape of a structure produced by mechanical forces that distort an otherwise normal structure. Deformations occur most often late in pregnancy or during delivery. A twin pregancy can cause deformations due to crowding of the twins late in pregnancy. A well-known example of a deformation is molding of the head of a baby born by vaginal delivery. There are usually no significant lasting effects of a deformation. A deformation is different from a malformation in timing and impact. In a malformation, the development of a structure is arrested, delayed, or misdirected early in embryonic life and the effect is permanent.
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1. Deviation of form from the normal; specifically, an alteration in shape and/or structure of a previously normally formed part. It occurs after organogenesis and often involves the musculoskeletal system ( e.g., clubfoot). 2. In rheology, the change in the physical shape of a mass by applied stress. [L. de-formo, pp. -atus, to deform, fr. forma, form]

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de·for·ma·tion (de″for-maґshən) [L. deformatio a disfiguring] 1. in dysmorphology, a type of structural defect characterized by the abnormal form or position of a body part, caused by a nondisruptive mechanical force. 2. the process of adapting in shape or form, as the change in shape of erythrocytes as they pass through capillaries.

Medical dictionary. 2011.

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Look at other dictionaries:

  • déformation — [ defɔrmasjɔ̃ ] n. f. • 1374; lat. deformatio, de forma « forme » 1 ♦ Action de déformer, de se déformer. Altération de la forme. Phys. La déformation d un solide, d une roche par des contraintes mécaniques. ⇒ aplatissement, cisaillement,… …   Encyclopédie Universelle

  • Deformation [2] — Deformation kontinuierlicher Medien. Jede stetige Formänderung eines kontinuierlichen Mediums kann in unendlich kleinen Bereichen als homogene oder affine Deformation aufgefaßt werden. Sind nämlich x, y, z die Koordinaten eines Punktes p des… …   Lexikon der gesamten Technik

  • Deformation — can refer to: Deformation (engineering), when an object gets changed due to force (introductory) Deformation (mechanics), where deformation is treated as the displacement of a continuum body Plastic deformation in solids, scientific treatment of… …   Wikipedia

  • Deformation — Déformation Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom …   Wikipédia en Français

  • Deformation [1] — Deformation der Flächen, im allgemeinen jede stetige Umformung, durch die eine Fläche in eine andre übergeht. Gewöhnlich versteht man aber unter Deformation die Fähigkeit einer Fläche, sich auf eine andre Fläche durch bloße Biegung oder Dehnung… …   Lexikon der gesamten Technik

  • deformation — mid 15c., transformation, from O.Fr. deformation and directly from L. deformationem (nom. deformatio), noun of action from pp. stem of deformare (see DEFORM (Cf. deform)) …   Etymology dictionary

  • Deformation — Def or*ma tion, n. [L. deformatio: cf. F. d[ e]formation.] 1. The act of deforming, or state of anything deformed. Bp. Hall. [1913 Webster] 2. Transformation; change of shape. [1913 Webster] …   The Collaborative International Dictionary of English

  • Deformation — Deformation. См. Деформация. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • deformation — index defacement, detriment, distortion Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • deformation — [dē΄fôr mā′shən, def΄ərmā′shən] n. [ME deformacioun < L deformatio] 1. a deforming or being deformed 2. the result of deforming; disfigurement 3. a change in form for the worse 4. Physics a) the changing of form or shape, as by stress …   English World dictionary

  • Déformation — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sur les autres projets Wikimedia : « Déformation », sur le Wiktionnaire (dictionnaire universel) en géologie, déformation en science des… …   Wikipédia en Français

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