pneumonoultramicroscopicsilicovolcanoconiosis  is notable for causing respiratory problems as well as unnecessary fatigue and frustration at spelling bees
"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
"pneumonoultramicroscopicsilicovolcanoconiosis  is notable for causing respiratory problems as well as unnecessary fatigue and frustration at spelling bees" What is the definition of "pneumonoultramicroscopicsilicovolcanoconiosis"?