• (n.) An oxide of zinc which collects on the sides of furnaces where zinc is sublimed. Formerly applied to the mineral calamine.
Cad'mi·a noun [ Latin cadmia calamine, Greek .... Confer Calamine .] (Min.) An oxide of zinc which collects on the sides of furnaces where zinc is sublimed. Formerly applied to the mineral calamine . 
Cadmia is an oxide of zinc which collects on the sides of furnaces where zinc is sublimed. The name was formerly applied to the mineral calamine.