Pneumonoultramicroscopicsilicovolcanoconiosis, a long word in English that has 45 letters and begins with the letter "P"
In The Simpsons episode "Grampa vs. Sexual Inadequacy", Abraham Simpson asks Homer whether pneumonoultramicroscopicsilicovolcanoconiosis is what's wrong with Marge.
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This word was invented in 1935 by Everett M. Smith, president of the National Puzzlers' League, at its annual meeting.