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This jawbreaker is a word that means "the practice of using long words", and is therefore self-referential. (grin)

Composed of 32 letters, it is far longer than its synonym sesquipedalium words,, from Horace's sesquipedalia verbs, words a foot and a half long. Greek, too, has a word for mile-long words: amaxiaia remata, "words large enough for a wagon."

See also: Bovine