The Collaborative International Dictionary of English v.0.48:

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

   Lapis calaminarisn. [NL.] (Min.) Calamine.

   Lapis infernalisn. [L.] Fused nitrate of silver; lunar
      caustic.
      [1913 Webster]