Definition of quindecasyllabic in US English:

quindecasyllabic

adjective

rare
  • Consisting of fifteen syllables; composed of lines of fifteen syllables each.

Origin

Late 19th century; earliest use found in The Athenaeum. Blend of classical Latin quīndecim fifteen and decasyllabic.

Pronunciation

quindecasyllabic

/kwɪnˌdɛkəˌsɪˈlabɪk/