Top definition
The Longest word in any english dictionary. It means a lung disease caused by breathing in particles of siliceous volcanic dust.
Dude, I think i caught PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS when i was on a tour of that volcano last week.
by Microwavesafe August 01, 2005
Get the mug
Get a PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS mug for your friend Riley.