Source : Webster's Revised Unabridged Dictionary (1913)

Cerusite \Ce"ru*site\, Cerussite \Ce"rus*site\, n. (Min.)
   Native lead carbonate; a mineral occurring in colorless,
   white, or yellowish transparent crystals, with an adamantine,
   also massive and compact.

Source : WordNet®

cerussite
     n : a mineral consisting of lead carbonate that is an important
         source of lead [syn: {white lead ore}]