1) a burning
1a) the burning by which metals are roasted and reduced
1b) by a figure drawn from a refiners fire
1b1) calamities or trials that test the character
Part of Speech: noun feminine
Citing in TDNT: 6:950, 975
From G4448; ignition, that is, (specifically) smelting (figuratively conflagration, calamity as a test): - burning, trial.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root πύρωσις; click on the second column to search for that grammatical form of the root πύρωσις; click on the third column to search for that word and grammatical form; click on the total to search for the root πύρωσις.