Source : Webster's Revised Unabridged Dictionary (1913)

Galena \Ga*le"na\, n.[L. galena lead ore, dross that remains
   after melting lead: cf. F. gal[`e]ne sulphide of lead ore,
   antidote to prison, stillness of the sea, calm, tranquility.]
   1. (Med.) A remedy or antidose for poison; theriaca. [Obs.]
      --Parr.

   2. (Min.) Lead sulphide; the principal ore of lead. It is of
      a bluish gray color and metallic luster, and is cubic in
      crystallization and cleavage.

   {False galena}. See {Blende}.

Source : WordNet®

galena
     n : soft blue-gray mineral; lead sulfide; a major source of lead