cinnabar

(noun) a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury.

(noun) large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort. Synonyms: cinnabar moth, Callimorpha jacobeae.

(adj) of a vivid red to reddish-orange color. Synonyms: vermilion, vermillion, Chinese-red.