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Webster 1913 Edition

Noun.

[Cf. F.

fuliginosité

The condition or quality of being fuliginous; sootiness; matter deposited by smoke.

[R.]

Noun.

[L. fuligo, soot, probably from the root of foul.]

Sootiness; matter deposited by smoke.

fuliginosity ‎(countable and uncountable, plural fuliginosities)