The definition is based on the Latin word it glosses (DMLBS fuliginosus, 1025a). The editor of TLL suggest that the word is ‘presumably a miscopying of some reflex of sulfur’.
s.
1soot particle (?):
(
MS: s.xiii
) fulliginosam: plein de susuriseez
i 368.2
susurisee (s.xiii)