Definition of multisyllable in US English:

multisyllable

noun

  • A polysyllable. rare.

adjective

  • = multisyllabic.

Origin

Mid 17th century; earliest use found in Obadiah Walker (1616–1699), college head and author. From multi- + syllable. Compare post-classical Latin multisyllabus, adjective.

Pronunciation

multisyllable

/ˌmʌltɪˈsɪləbl/