Plastic Surgery, branch of surgery, dealing with the remodeling of any portion of the human body that has been damaged or deformed. The malformation may have occurred congenitally, that is, at birth, as a child born with a cleft palate or a cleft lip (see Birth Defects). Disfigurement may also be the result of injury or of deforming surgery required in treating such diseases as cancer. The primary objectives of plastic surgery are the correction of defects, the restoration of lost function, and the improvement of appearance.
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Atomic clock, electric or electronic timekeeping device that is controlled by atomic or molecular oscillations. A timekeeping device must co...
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. Vacuum Tubes, electronic devices, consisting of a glass or steel vacuum envelope and two or more electrodes between which electrons can mo...
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. Evolution, in biology, complex process by which the characteristics of living organisms change over many generations as traits are passed ...