Top Definition
1. A disease gotten from inhalation of diminative particles of silica or quartz.
Pneumono - Lung
Ultra Microscopic - Very small/fine
silico volcano - igneous, silica
coniosis - disease
; Black Lung
In the mid 1880's, miners would get pneumonoultramicroscopicsilicovolcanoconiosis.
by Kyle Zager January 06, 2005

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A form of silicosis caused by breathing in siliceous volcanic dust.

Exceeded electrophotomicrographically as the longest recognized word in English.
Me: *COUGH*
You: Dude, stop smoking.
Me: I don't smoke.
You: Yes, you do.
Me: No, I have pneumonoultramicroscopicsilicovolcanoconiosis
by OfEternity June 26, 2005

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An inflammation of the lungs caused by microscopic grains of certain types of rock.

*NOTE* This word was actually coined in a deliberate attempt to be the longest word in the english language, although you would be hard-pressed to find it in the language dictionary as it is a medical/scientific term.
"Dude, now that I've learned how to spell antidisestablishmentarianism, what am I going to do to make people think I'm smart?"

"Quiet man, I'm trying to name this condition we discovered today. Its an inflammation of the lungs caused by microscopic grains of certain types of rock."

"Hey, I smell opportunity! How long could we make this word?"

"Pretty long...I suppose we could stretch it to pneumonoultramicroscopicsilicovolcanoconiosis"
by Fludence March 09, 2009

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(noun) A lung disease caused by the inhalation of silica or quartz dust
From "The Simpsons" Grampa vs. Sexual Inadequacy:
Abe: Welcome home, Son. I broke two lamps and lost all your mail. What's wrong with your wife?
Homer: Never mind, you wouldn't understand.
Abe: Flu?
Homer: No.
Abe: Protein deficiency?
Homer: No.
Abe: Pneumonoultramicroscopicsilicovolcanoconiosis?
Homer: No.
Abe: Unsatisfying sex life?
Homer: N -- yes!
by Júan José June 08, 2005

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A disease of the lungs caused by the habitual inhalation of silica dusts, characterized by massive fibrosis, shortness of breath in the lungs, and violent sneezing.
She has been diagnosed with pneumonoultramicroscopicsilicovolcanoconiosis.
by Leonardo Sidis 424 August 16, 2005

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A factitious word alleged to mean "a lung disease caused by the inhalation of very fine silica dust" but occurring chiefly as an instance of a very long word. (Definition retrieved from Oxford English Dictionary)
Pneumonoultramicroscopicsilicovolcanoconiosis is notable for causing respiratory problems as well as unnecessary fatigue and frustration at spelling bees.
by bill kapok March 15, 2005

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an extremely long word often cited as the longest in the english language referring to a disease caused by the inhalation of silica dust
Bob got pneumonoultramicroscopicsilicovolcanoconiosis after working in the mines for 10 years.
by mikmik March 10, 2009

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