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WordReference Random House Unabridged Dictionary of American English © 2016
ad•a•man•tine  (ad′ə mantēn, -tin, -tīn),USA pronunciation adj. 
  1. utterly unyielding or firm in attitude or opinion.
  2. too hard to cut, break, or pierce.
  3. Jewelrylike a diamond in luster.
  • Greek adamántinos. See adamant, -ine1
  • Latin adamantinus
  • Middle English 1200–1250

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