a) compression; the packing together of loose matter
b) something packed together tightly; a mass of densely-packed matter

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  • Impaction — Impaction, from the Latin impingere , is a medical term used to describe several different types of blockage. In Reptiles Impaction occurs in reptiles when they consume something that they cannot digest. Common causes of impaction are rocks and… …   Wikipedia

  • Impaction — Im*pac tion, n. [L. impactio a striking : cf. F. impaction.] 1. (Surg.) 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. [1913 Webster] 2. An… …   The Collaborative International Dictionary of English

  • impaction — ⇒IMPACTION, subst. fém. A. MÉD. Rupture d un os avec déviation. (Dict. XIXe et XXe s.). B. CHIR. Action d appliquer fortement deux fragments osseux d une fracture l un contre l autre (notamment dans les fractures du col du fémur). Pratiquer une… …   Encyclopédie Universelle

  • impaction — (n.) 1739, from L. impactionem (nom. impactio) a striking against, noun of action from pp. stem of impingere (see IMPINGE (Cf. impinge)) …   Etymology dictionary

  • Impaction — Sur les autres projets Wikimedia : « Impaction », sur le Wiktionnaire (dictionnaire universel) L impaction est un colmatage des viscères par une quantité trop importante de cellulose non digérée. Ainsi chez le bovin une ration trop …   Wikipédia en Français

  • impaction — /im pak sheuhn/, n. 1. an act or instance of impacting. 2. the state of being impacted; close fixation. 3. Dentistry. the condition in which a tooth is impacted. [1730 40; < LL impaction (s. of impactio), equiv. to L impact(us), ptp. of impingere …   Universalium

  • impaction fracture — n a fracture that is impacted …   Medical dictionary

  • impaction — noun Date: 1739 the act of becoming or the state of being impacted; especially lodgment of something (as feces) in a body passage or cavity …   New Collegiate Dictionary

  • impaction — The process or condition of being impacted. dental i. confinement of a tooth in the alveolus and prevention of its eruption into normal position. SEE ALSO: impacted tooth …   Medical dictionary

  • impaction — (in pa ksion) s. f. Terme de chirurgie. Fracture du crâne, d une côte, du sternum, en plusieurs pièces, dont les unes font saillie en dedans et les autres en dehors. ÉTYMOLOGIE    Lat. impactionem, choc, de impactum, supin de impingere, choquer,… …   Dictionnaire de la Langue Française d'Émile Littré

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