Looked up for you:
Pneu-mo-no-ul-tra-mi-cro-scop-ic-sil-i-co-val-ca-no-co-ni-o-sis
(Do I have to do pronunciation?) HINT: sounds like how it is spelled, only noo sound for pneu)
n. a disease of the lungs caused by breathing extremely fine siliceous dust.
Holy

!!! I spelled it right from memory!!!
**Addition:
I didn't double-post, they deleted. I deleted my response to what they had**