sesquipedalian

(sĕs'kwĭ-pĭ-dāl'yən)
n.
A long word.

adj.

1. Given to or characterized by the use of long words.
2. Long and ponderous; polysyllabic.

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adjective

Having many syllables: long¹, polysyllabic, sesquipedal. See long/short.

[fr. L. sesquipedalis, of a foot and a half in length]
n. a long word  adj. 1) given to the use of long words 2) polysyllabic

See words rhyming with "sesquipedalian."