Source : Webster's Revised Unabridged Dictionary (1913)

Cinnabar \Cin"na*bar\, n. [L. cinnabaris, Gr. ?; prob. of
   Oriental origin; cf. Per. qinb[=a]r, Hind. shangarf.]
   1. (Min.) Red sulphide of mercury, occurring in brilliant red
      crystals, and also in red or brown amorphous masses. It is
      used in medicine.

   2. The artificial red sulphide of mercury used as a pigment;
      vermilion.

   {Cinnabar Gr[ae]corum}. [L. Graecorum, gen. pl., of the
      Greeks.] (Med.) Same as {Dragon's blood}.

   {Green cinnabar}, a green pigment consisting of the oxides of
      cobalt and zinc subjected to the action of fire.

   {Hepatic cinnabar} (Min.), an impure cinnabar of a
      liver-brown color and submetallic luster.

Source : WordNet®

cinnabar
     adj : of a vivid red to reddish-orange color [syn: {vermilion}, {vermillion},
            {Chinese-red}]

cinnabar
     n 1: a heavy reddish mineral consisting of mercuric sulfide; the
          chief source of mercury
     2: large red-and-black European moth; larvae feed on leaves of
        ragwort; introduced into United States to control ragwort
        [syn: {cinnabar moth}, {Callimorpha jacobeae}]