Pneumonoultramicroscopicsilicovolcanoconiosis This is often cited as the longest word in the English language, with 45 letters. It refers to a lung disease caused by inhaling very fine silica particles.
Supercalifragilisticexpialidocious Made famous by the 1964 movie "Mary Poppins," this word has 34 letters and is often used as a nonsense word meaning "fantastic" or "wonderful."
HippopotomonstrosesquippedaliophobiaThis word is the fear of long words and has 36 letters.
Antidisestablishmentarianism This word has 28 letters and refers to opposition to the disestablishment of the Church of England.
FloccinaucinihilipilificationThis word has 29 letters and refers to the act of deeming something as trivial or worthless.
Honorificabilitudinitatibus This word has 27 letters and was coined by Shakespeare in "Love's Labour's Lost." Its meaning is unclear, but it is believed to refer to the state of being able to achieve honors.
IncomprehensibilitiesThis word has 21 letters and refers to things that are difficult to understand.
PsychoneuroendocrinologicalThis word has 27 letters and refers to the study of the interactions between the mind, nervous system, and hormones.
Dichlorodifluoromethane This word has 24 letters and refers to a type of refrigerant.
TrinitrophenylmethylnitramineThis word has 32 letters and refers to a type of explosive.
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