[1] : The Collaborative International Dictionary of English v.0.48

infernal \infer"nal\, a. f. infernal, l. infernalis, fr.
   infernus that which lies beneath, the lower. see inferior.
   1913 webster
   1. of or pertaining to or suitable for the lower regions,
      inhabited, according to the ancients, by the dead;
      pertaining to pluto's realm of the dead, the tartarus of
      the ancients.
      1913 webster

            the elysian fields, the infernal monarchy. --garth.
      1913 webster

   2. of or pertaining to, resembling, or inhabiting, hell;
      suitable for hell, or to the character of the inhabitants
      of hell; hellish; diabolical; as, infernal spirits, or
      conduct.
      1913 webster

            the instruments or abettors in such infernal
            dealings.                             --addison.
      1913 webster

   infernal machine, a machine or apparatus maliciously
      designed to explode, and destroy life or property.

   infernal stone lapis infernalis, lunar caustic;
      formerly so called. the name was also applied to caustic
      potash.

   syn: tartarean; stygian; hellish; devilish; diabolical;
        satanic; fiendish; malicious.
        1913 webster
see also:
inferior infernal machine infernal stone lapis infernalis 

[2] : 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
see also:
lapides lapis calaminaris lapis infernalis 

Lapis >> L Words
Lapis, definition of term: Lapis
lapis_pag1.html

Lapis Lazuli >> L Words
Lapis Lazuli, definition of term: Lapis Lazuli
lapis+lazuli_pag1.html