word { Sesquipedalian

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
ses·qui·pe·da·li·an /ˌsɛskwɪpɪˈdeɪliən, -ˈdeɪlyən/ Pronunciation Key - Show Spelled Pronunciation[ses-kwi-pi-dey-lee-uhn, -deyl-yuhn] Pronunciation Key - Show IPA Pronunciation
–adjective Also, ses·quip·e·dal /sɛsˈkwɪpɪdl/ Pronunciation Key - Show Spelled Pronunciation[ses-kwip-i-dl] Pronunciation Key - Show IPA Pronunciation.
1. given to using long words.
2. (of a word) containing many syllables.
–noun
3. a sesquipedalian word.
[Origin: 1605–15; < L sésquipedālis measuring a foot and a half (see sesqui-, pedal) + -an]