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Webster 1913 Edition

Noun.

pl.

(Min.)

The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.

pyrognostics ‎(uncountable)

(dated) The characteristics of a substance, especially of a mineral or metal salt, that are revealed by heat, especially by the use of a blowpipe and a charcoal block.