Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
sesquipedalian is an adjective and noun meaning "given to the overuse of long words". It carries 3 recorded senses.
given to the overuse of long words
“sesquipedalian orators”
“this sesquipedalian way of saying one has no money”
(of words) long and ponderous; having many syllables
“sesquipedalian technical terms”
a very long word (a foot and a half long)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sesquipedalian come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.