Sesquipedalia
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a very long word (a foot and a half long)
Word Usage
"Cowpeas (Vigna sinensis, V. unguiculata, V. sesquipedalia)"
Hypernym
Words that are more generic or abstract
polysyllabic word
polysyllable
suggests
sesquipedalian