Source : Webster's Revised Unabridged Dictionary (1913)

Millerite \Mil"ler*ite\, n. [From W. H. Miller, of Cambridge,
   Eng.] (Min.)
   A sulphide of nickel, commonly occurring in delicate
   capillary crystals, also in incrustations of a bronze yellow;
   -- sometimes called {hair pyrites}.

Millerite \Mil"ler*ite\, n.
   A believer in the doctrine of William Miller (d. 1849), who
   taught that the end of the world and the second coming of
   Christ were at hand.

Source : WordNet®

millerite
     n : a yellow mineral consisting of nickel sulfide; a minor
         source of nickel