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Webster's 1828 Dictionary

PYROLITHIC

a.[Gr. , fire; stone. ] The pyrolithic acid is an acid of recent discovery. It is obtained from the silvery white plates which sublime from uric acid concretions, when distilled in a retort.

 

Webster's 1913 Dictionary

PYROLITHIC

Pyr `o *lith "ic, a. Etym: [Pyro- + lithic. ] (Old Chem. )

 

Defn: Same as Pyrouric, or Cyanuric.