sesquipedalian , (less commonly) sesquipedal
1 tending to use very long words
2 (of words or expressions) long and ponderous; polysyllabic
3 a polysyllabic word
(C17: from Latin sesquipedalis of a foot and a half (coined by Horace in Ars Poetica), from sesqui- + pedalis of the foot, from pes foot)
English Collins Dictionary - English Definition & Thesaurus
the practice of using very long words. Also sesquipedalism, sesquipedality. — sesquipedal, sesquipedalian, adj.
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