pneu·mo·co·ni·o·sis 
(n′mō-kō′nē-ōsĭs, ny′-)
(n′mō-kō′nē-ōsĭs, ny′-)n.
Any of several, usually occupational diseases of the lungs, such as asbestosis or silicosis, caused by prolonged inhalation of especially mineral or metallic dust particles.
[PNEUMO- + Greek konis, koniā, dust + -OSIS.]
pneu′mo·co′ni·otic (-ŏtĭk) adj. & n.