reduction


reduction
1. The restoration, by surgical or manipulative procedures, of a part to its normal anatomic relation. SYN: repositioning (2). 2. In chemistry, a reaction involving a gain of one or more electrons by a substance, such as when iron passes from the ferric (3+) to the ferrous (2+) state, or when hydrogen is added to the double bond of an organic compound, or when an aldehyde is converted to an alcohol. [L. reductio, fr. re-duco, pp. ductus, to lead back]
- r. of chromosomes the process during meiosis whereby one member of each homologous pair of chromosomes is distributed to a sperm or ovum; the diploid set of chromosomes (46 in humans) is thus reduced to the haploid set in each gamete; union of the sperm and ovum then restores the diploid or somatic number in the one-cell zygote.
- closed r. of fractures r. by manipulation of bone, without incision in the skin.
- r. en masse r. of hernial sac and contents, so that intestinal obstruction is still present.
- open r. of fractures r. by manipulation of bone, after surgical exposure of the site of the fracture.
- selective r. a technique for intrauterine termination of one or more fetuses while leaving one or more fetuses undisturbed, usually in pregnancies with fetal anomalies or with multiple gestations. SYN: selective termination.
- tuberosity r. the surgical excision of excessive fibrous or bony tissue in the area of the maxillary tuberosity prior to the construction of prosthetic appliances.

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re·duc·tion ri-'dək-shən n
1) the replacement or realignment of a body part in normal position or restoration of a bodily condition to normal
2) the process of reducing by chemical or electrochemical means
3) the psychological diminishment of emotion or needs through activity or adjustment
4) MEIOSIS specif production of the gametic chromosome number in the first meiotic division

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n.
(in surgery) the restoration of a displaced part of the body to its normal position by manipulation or operation. The fragments of a broken bone are reduced before a splint is applied; a dislocated joint is reduced to its normal seating; or a hernia is reduced when the displaced organ or tissue is returned to its usual anatomical site.

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re·duc·tion (re-dukґshən) [L. reductio] 1. the correction of a fracture, dislocation, or hernia. 2. in chemistry, the addition of hydrogen to a substance, or more generally, the gain of electrons.

Medical dictionary. 2011.

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  • réduction — [ redyksjɔ̃ ] n. f. • fin XIIIe « rapprochement »; lat. reductio, de reducere → réduire I ♦ (XIVe) Opération qui consiste à remettre en place (un os luxé, fracturé; un organe déplacé). Réduction d une articulation luxée. Par ext. Réduction d une… …   Encyclopédie Universelle

  • Reduction — Reduction, reduced, or reduce may refer to:cienceChemistry*Reduction – chemical reaction in which atoms have their oxidation number (oxidation state) changed. **Reduced gas – a gas with a low oxidation number **Ore reduction: see… …   Wikipedia

  • reduction — re‧duc‧tion [rɪˈdʌkʆn] noun FINANCE 1. [countable, uncountable] when prices, costs etc become lower or are made lower: • Our winter sale includes many price reductions. • We can make a reduction (= sell something more cheaply …   Financial and business terms

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

  • Reduction — Re*duc tion (r[ e]*d[u^]k sh[u^]n), n. [F. r[ e]duction, L. reductio. See {Reduce}.] 1. The act of reducing, or state of being reduced; conversion to a given state or condition; diminution; conquest; as, the reduction of a body to powder; the… …   The Collaborative International Dictionary of English

  • reduction — Reduction. s. f. v. Action de reduire. Reduction d une ville à l obéissance du Prince. la procession pour la reduction de Paris. reduction d une pinte de liqueur à une chopine. reduction des especes, des monnoyes. reduction des sols en livres.… …   Dictionnaire de l'Académie française

  • Reduction — Saltar a navegación, búsqueda Reduction Álbum de Peter Banks Publicación 1999 Género(s) Rock progresivo …   Wikipedia Español

  • reduction — Reduction, f. acut. Est proprement, ramenement (s il se peut dire ainsi) d une chose à son premier lieu et estat, et est pur Latin de Reductio, hormis du son et prolation François. Et selon ceste deduction, on peut dire Reduction estre,… …   Thresor de la langue françoyse

  • reduction — index abatement (reduction), abridgment (condensation), abstract, capsule, curtailment, decrease, deduction ( …   Law dictionary

  • reduction — [ri duk′shən] n. [LME reduccion < MFr reduction < L reductio < reductus, pp. of reducere] 1. a reducing or being reduced 2. anything made or brought about by reducing, as a smaller copy, lowered price, sauce of concentrated liquid, etc.… …   English World dictionary

  • reduction — reduction. См. редукция. (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.


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