Definition of tetrasyllable in English:

tetrasyllable

noun

  • A word of four syllables.

    • ‘Banville has likewise tried his hand at short strophes composed entirely of tetrasyllables, as have also Richepin and Verlaine.’
    • ‘‘One is monosyllabic, the other tetrasyllable,’ Spindrift begins.’
    • ‘Since the "Pater noster" text contains no penult-accented tetrasyllables, only results for antepenult-accented tetrasyllables can be presented, which Figure 22 does.’

Pronunciation:

tetrasyllable

/ˈtɛtrəsɪləb(ə)l/