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Pronunciation: sen′trad


  1. Toward the center.
  2. A unit of measurement of the refracting strength of a prism; it corresponds to the deviation of a ray of light, the arc of which is 1/100 of the radius of the circle, or 0.57°.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.