1 definition by The first definition of Arno in this dictionary

posibly the longest word in the english language 48 letters long, 19 syllables the word means a deadly disease that will one day come upon the earth causing judgement day to occer and the end of the world yatta yatta yatta....
Oh my God that pneumonoultramicroscopicsilicovolcanoconiosis is coming upon us/ going to kill us!!!
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