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  Definition of hyperparathyroidism
  1. excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis)
 
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Igor_Ivanovich_Sikorsky means United States industrialist (born in Russia) who designed the first four-engine airplane and the first mass-produced helicopter (1889-1972); ... more
 
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