Pneumonoultramicroscopicsilicovolcanoconiosis

Pneumonoultramicroscopicsilicovolcanoconiosis，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』。因為吸咗矽而出嘅病叫 『Silicosis』。

呢 45 個字母又叫 P45 ，係第一次喺 1939年嘅 「supplement to the Merriam-Webster New International Dictionary, Second Edition」 度出現。

:en:Longest word in English
 :en:Floccinaucinihilipilification
 :en:Antidisestablishmentarianism
 :en:Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu

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