Expletory is a rarely used adjective that describes something as serving as an expletive or expressing excess. The word is spelled with three syllables: eks-puh-luh-tawr-ee, with the primary stress on the third syllable. The first syllable sounds like "eks," the second syllable sounds like "puh," the third syllable sounds like "luh," and the fourth syllable sounds like "tawr-ee." The IPA transcription of expletory is /ɛkˈspləˌtɔri/. While the word is not commonly used, it is a valuable addition to one's vocabulary.
Serving to fill up.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.