Definition of diametrical adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌdaɪəˈmetrɪkl//
    ; NAmE NAmE//ˌdaɪəˈmetrɪkl//
    [usually before noun]
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  1. 1used to emphasize that people or things are completely different He's the diametrical opposite of his brother.
  2. 2relating to the diameter of something
  3. Word Originmid 16th cent. (in sense (2)): from Greek diametrikos (from diametros ‘measuring across’: see diameter) + -al.
See the Oxford Advanced American Dictionary entry: diametrical