ses-kwi-puh-DAY-lee-uhn · adjective, noun
sesquipedalian
Given to using long words, or describing a word that is unusually long.
Where the word comes from
From Latin sesquipedalis, literally “a foot and a half long,” formed from sesqui- (“one and a half”) and pes, pedis (“foot”).
In a sentence
“His sesquipedalian toast made the wedding guests reach for their dictionaries.”