(of words) long and ponderous; having many syllables; "sesquipedalian technical terms"

Sesquipedalian is a jocular adjective describing extremely long words or their usage. It is derived from a nonce word used by the Roman author Horace, in his work Ars Poetica (The Art of Poetry). The quote is as follows: "Proicit ampullas et sesquipedalia verba," which means, "He throws aside his paint pots and his words that are a foot and a half long."