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Webster 1913 Edition

Noun.

(Chem.)

The state or quality of being deflagrable.

The ready

deflagrability

. . . of saltpeter.

Boyle.

Noun.

Combustibility; the quality of taking fire and burning away, as a metallic wire; a chimical term.

deflagrability ‎(uncountable)

(chemistry, archaic) The quality of being deflagrable.
The ready deflagrability […] of saltpeter. — Boyle.