sesquipedalian

Talk about a cool word! This wonderful word, pronounced “ses-kwuh-puh-DAYL-yuhn,” describes words much like itself: long. As an adjective, it means:
1. Given to or characterized by the use of long words.
2. Long and ponderous; having many syllables.

This is according to Dictionary.com, which featured the word as Word of the Day for January 13. The listing is available at:
http://dictionary.reference.com/wordoftheday/archive/2006/01/13.html

Now if I can just remember how to spell it, maybe I will be able to use it!