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1. The restoration, by surgical or manipulative procedures, of a part to its normal anatomical relation.repositioning; 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 incision in skin and muscle over 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.
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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