Source : Webster's Revised Unabridged Dictionary (1913)

Siderosis \Sid`e*ro"sis\, n.[NL., fr. Gr. ??? iron.] (Med.)
   A sort of pneumonia occuring in iron workers, produced by the
   inhalation of particles of iron.

Source : WordNet®

siderosis
     n : fibrosis of the lung caused by iron dust; occurs among
         welders and other metal workers