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sesquipedalian \ses-kwuh-puh-DAYL-yuhn\, adjective:
1. Given to or characterized by the use of long words.
2. Long and ponderous; having many syllables.

noun:
1. A long word.

As a sesquipedalian stylist, he can throw a word like 'eponymous" into a sentence without missing a beat.
-- Campbell Patty, "The sand in the oyster", The Horn Book Magazine, May 15, 1996

. . .her eccentric family's addiction to sesquipedalians (that big word for "big words"), and her furtive passion for flossy mail-order-catalog prose.
-- David Browne, "Books/The Week", Entertainment Weekly, October 23, 1998

Sesquipedalian comes from Latin sesquipedalis, "a foot and a half long, hence inordinately long," from sesqui, "one half more, half as much again" + pes, ped-, "a foot."

Dictionary.com Entry here.