D defs.my
Entry 2 senses Webster, 1913

Adamantine

· Ad·a·man·tine · IPA /ˌædəˈmænˌtaɪn/
01 a. Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.
  1. 1.
    Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.
  2. 2.
    Like the diamond in hardness or luster.(Min.)