Source : Webster's Revised Unabridged Dictionary (1913)

Minium \Min"i*um\ (?; 277), n. [L. minium, an Iberian word, the
   Romans getting all their cinnabar from Spain; cf. Basque
   armine['a].] (Chem.)
   A heavy, brilliant red pigment, consisting of an oxide of
   lead, {Pb3O4}, obtained by exposing lead or massicot to a
   gentle and continued heat in the air. It is used as a cement,
   as a paint, and in the manufacture of flint glass. Called
   also {red lead}.

Source : WordNet®

minium
     n : a reddish oxide of lead (Pb3O4) used as a pigment in paints
         and in glass and ceramics [syn: {red lead}]