the longest word in English

[نجم السهيل]

hello to all
do u have any idea about the longest word in the English ********?
of course, it is useless to look up this word in an ordinary dictionary.
now, here's the answer:
the following word is the longest word which you can find in an all-purpose dictionary:

pneumonoultramicroscopicsilicovolcanoconiosis

what does it mean? we can break this word down into its parts to see what each part means.
pneu: breath, of lungs
mono: one, single
ultra: extremely
micro: small
scopic: visible
silico: of silicon, a common non-****llic element of the earth's crust
volcano: of volcanic origin
coni: cone-like or cone-shaped
osis: abnormal or diseased condition

the word describes a disease of the lungs which is commonly referred to as "Black Lung Disease". this disease occurs among coalminers. it involves breathing in coal dust, which forms cone-shaped deposits in the lungs.