I can’t even pronounce this one. But if you look on wiktionary you can listen to the audio. It has been a fun and educational exercise to find unusual words that have anything to do with writing. This one is a long shot. A long shot because short words are the style in my creativity realm. Otherwise my memoir would require a hippo to carry it around.
WittBits 
I saw the title of this post and thought, “you HAVE to be joking! surely there’s no such word?” but I listened to the pronunciations. NB The Northern California man gets it wrong and puts an extra syllable in there “…sesquidapedalian”.
Ros, visiting from The Writing Desk
Well, that’s a mouth full! LOL Love the word theme. @sheilamgood at Cow Pasture Chronicles
Wow, that is some word! Great choice 🙂
Debbie
My H word was a mouthful too. Did the people coming up with these words even try to say them first????
~Ninja Minion Patricia Lynne aka Patricia Josephine~
Story Dam
Patricia Lynne, Indie Author