Lapis calaminaris

from The Collaborative International Dictionary of English v.0.48

Lapis \La"pis\, n.; pl. {Lapides}. [L.]
   A stone.
   [1913 Webster]

   {Lapis calaminaris}n. [NL.] (Min.) Calamine.

   {Lapis infernalis}n. [L.] Fused nitrate of silver; lunar
      caustic.
      [1913 Webster]