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

     

    diamantine

     adjective
    adjective
    BrE BrE//ˌdaɪəˈmæntiːn//
     
    ; NAmE NAmE//ˌdaɪəˈmæntiːn//
     
    (specialist)
     
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  1. 1made from, or looking like, diamonds
  2. 2very hard or strong
  3. Word Origin mid 16th cent. (in the sense ‘hard as diamond’): from French diamantin, from diamant ‘diamond’.
See the Oxford Advanced American Dictionary entry: diamantine