sesquipedalian
Pronunciation:
/ˌsɛskwɪpɪˈdeɪlɪən//ˌsɛskwɪpɪˈdeɪlɪən/noun
Definitions
A long word.
A person who uses long words.
adjective
Definitions
(of a word or words) Long; polysyllabic.
Pertaining to or given to the use of overly long words.
Example: Our dinner guest was so sesquipedalian that no one could understand what he said.