cinnabar UK /ˈsɪn.əˌbɑː(ɹ)/US /ˈsɪn.əˌbɑɹ/noun 4adjective 1forms 3 noun4 •A deep red mineral, mercuric sulfide, HgS; the principal ore of mercury; such ore used as the pigment vermilion. •A bright red colour tinted with orange. •A species of erebid moth, Tyria jacobaeae, having red patches on its predominantly black wings.There are a few day-flying exceptions such as hummingbird hawk-moths, silver Ys, cinnabars, scarlet tigers and burnets but, in general, knowledge of moths lags behind that of butterflies. — 2015 •Synonym of dragon's blood (“type of resin”). adjective1 •Of a bright red colour tinted with orange. formscinnabars · more cinnabar · most cinnabar