retraction

1. A shrinking, drawing back, or pulling apart. 2. Posterior movement of teeth, usually with the aid of an orthodontic appliance. [L. retractio, a drawing back]
- gingival r. 1. lateral movement of the gingival margin away from the tooth surface; may be indicative of underlying inflammation or pocket formation; 2. displacement of the marginal gingivae away from the tooth by mechanical, chemical, or surgical means.
- mandibular r. a type of facial anomaly in which the gnathion lies posterior to the orbital plane.

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re·trac·tion ri-'trak-shən n an act or instance of retracting specif backward or inward movement of an organ or part <\retraction of the nipple or skin overlying the tumor (Jour. Amer. Med. Assoc.)>

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n.
1. (in obstetrics) the quality of uterine muscle fibres of remaining shortened after contracting during labour. This results in a gradual progression of the fetus downwards through the pelvis. The basal portion of the uterus becomes thicker and pulls up the dilating cervix over the presenting part.
2. (in dentistry) the drawing back of one or more teeth into a better position by an orthodontic appliance.

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re·trac·tion (re-trakґshən) [L. retrahere to draw back] 1. the act of drawing back; the condition of being drawn back. 2. distal movement of teeth, usually accomplished with an orthodontic appliance.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • rétraction — [ retraksjɔ̃ ] n. f. • 1515; « action de se retirer » fin XIVe; lat. retractio 1 ♦ Acte par lequel certains animaux, certains organes, en présence de situations ou d excitations déterminées, se contractent et se déforment de façon à occuper le… …   Encyclopédie Universelle

  • retraction — re·trac·tion /ri trak shən/ n: an act of taking back or withdrawing retraction of a confession her retraction of the defamatory statement Merriam Webster’s Dictionary of Law. Merriam Webster. 1996 …   Law dictionary

  • Retraction — Re*trac tion (r[ e]*tr[=a]k sh[u^]n), n. [Cf. F. r[ e]traction, L. retractio a drawing back, hesitation.] 1. The act of retracting, or drawing back; the state of being retracted; as, the retraction of a cat s claws. [1913 Webster] 2. The act of… …   The Collaborative International Dictionary of English

  • Retraction — (v. lat.), 1) das Zurückziehen; 2) das Zusammenziehen der Nerven …   Pierer's Universal-Lexikon

  • Retraction — Retraction, lat. deutsch, Zurückziehung; die Zusammenziehung der Nerven …   Herders Conversations-Lexikon

  • retraction — (n.) late 14c., from L. retractionem (nom. retractio), from pp. stem of retractare revoke, cancel, from re back + tractere draw violently, frequentative of trahere to draw (see TRACT (Cf. tract) (1)). Originally the title of a book by St.… …   Etymology dictionary

  • retraction — [ri trak′shən] n. [ME retraccion < LL retractio] 1. a retracting or being retracted; specif., a) withdrawal, as of a statement, promise, charge, etc. b) a drawing or being drawn back or in 2. power of retracting …   English World dictionary

  • Retraction — A retraction is a public statement, either in print, or by verbal statement that is made to correct a previously made statement that was incorrect, invalid, or in error. The intent of a public retraction is to correct any incorrect… …   Wikipedia

  • retraction — retract re‧tract [rɪˈtrækt] verb [transitive] 1. FINANCE if a company retracts bonds, shares etc, it takes them off the market by buying them back from investors; = RETIRE: • It will use its credit line to retract C$53.3 million in preferred… …   Financial and business terms

  • retraction — UK [rɪˈtrækʃ(ə)n] / US [rɪˈtrækʃən] noun Word forms retraction : singular retraction plural retractions a) [countable] a statement in which you say that something that you previously said or wrote is not true Did you demand a full retraction? b)… …   English dictionary

  • rétraction — (ré tra ksion ; en vers, de quatre syllabes) s. f. 1°   Terme d histoire naturelle. État d une partie rétractile, d une partie retirée, rentrée en dedans. •   Une substance qui se dilate par la chaleur, éprouve en se refroidissant une contraction …   Dictionnaire de la Langue Française d'Émile Littré

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