adamas

Etymology
From, either from +  or of  origin.

Noun

 * 1) Adamant; the hardest steel or iron; diamond; an object made of adamant.
 * 2) Anything which is inflexible, firm or lasting.
 * 3)  Hard, invincible, unconquerable, unyielding, inexorable, stubborn, intractable.

Etymology
, from. Compare.

Noun

 * , adamantine
 * 1)  a natural magnet; magnetite