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Pronunciation: kī


  1. The 22nd letter of the Greek alphabet, χ.
  2. In chemistry, denotes the 22nd in a series.
  3. Symbol for the dihedral angle between the α-carbon and the side chains of amino acids in peptides and proteins.

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