Pneumonoultramicroscopicsilicovolcanoconiosis（ 聽吓 (幫手·有關)；有時咁結尾 -koniosis），據牛津字典講，係世界上最長嘅英文字，定義 "a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust found in volcanoes' but occurring chiefly as an instance of a very long word."，意思係『火山肺矽病』。因為吸咗矽（火山又好，其他情況都好）而出嘅病叫 『Silicosis』。
- en:Longest word in English
- Oxford English Dictionary online, Oxford University Press, quote listed in "Second Edition 1989" definition. "Draft revision Sept. 2006" definition reads "a word invented (prob. by Everett M. Smith (born 1894), president of the National Puzzlers' League in 1935) in imitation of polysyllabic medical terms, alleged to mean 'a lung disease caused by the inhalation of very fine sand and ash dust' but occurring only as an instance of a very long word." Retrieved on 2007-10-08.
- Cole, Chris. (1989.) "The Biggest Hoax". Word Ways: The Journal of Recreational Linguistics, via wordways.com. Retrieved on 2007-10-08.
- Miller, Jeff. "A collection of word oddities and trivia: page 11, long words". (Personal website.) Retrieved on 2007-10-08.