noun
1. : an orange-red to brick-red lead oxide Pb 3 O 4 that is prepared by heating lead monoxide in the presence of air, that when produced commercially may contain litharge and other impurities, and that is used chiefly in storage-battery plates, in glass and ceramics, and as a paint pigment (as for protecting metals from corrosion) — called also minium
2. : fiery red
3. slang : catsup