Webster's English Dictionary

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adamantine

ad.a.man.tine \.ad-*-'man-.te-n, -.ti-n, -'mant-*n\ aj [ME, fr. L 
   adamantinus, fr. Gk adamantinos, fr. adamant-, ]adamas 1: made of or having 
   the quality of adamant  2: rigidly firm : UNYIELDING  3: resembling the 
   diamond in hardness or luster