largest word word in the world is Pneumonoultramicroscopicsilicovolcanocon

Pneumonoultramicroscopicsilicovolcanocon also called pneumonoultramicroscopicsilicovolcanoconiosis, the word at 45 letters is longest word in the world. The meaning of this word according to Oxford English Dictionary, "A factitious word alleged to mean 'A lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs.'"

The word noun is [NOO-muh-noh-UL-truh-MY-kruh-SKOP-ik-SIL-i-koh-VOL-kay-no-koh-NEE-o-sis, nyoo-]. A condition meeting the word's definition is normally called silicosis. Another longest english words Honorificabilitudinitatibus, Antidisestablishmenta, and Floccinoccinihilipilificatio.