Given to or characterized by the use of long words.(adjective)
Long and ponderous; polysyllabic.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "sesquipedalian" in a sentence
""Clarence Thomas, please spell the word sesquipedalian and then use it in a form of a question.""
"Let his obituary read, "Douglas Martin, a newspaperman who once got the word" sesquipedalian "onto the front page of the New York Times ....""
"From the time the moderator gives the word, let's say it's "sesquipedalian," until your progeny very slowly spells it correctly, doesn't it seem a lifetime?"