pneumonoultramicroscopicsilicovolcanoconiosis Definition A hypothetical, invented disease of the lungs, caused by inhaling mineral or metallic dust, such as silicon and quartzite, over a long period. Etymology Late 19th century, from Ancient Greek πνεύμον (pneumon), lung + -o- + Latin ultra , beyond + microscopic + silico- + volcano + Ancient Greek κόνις (konis), dust + -osis |
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