Definition of trisyllable in English:

trisyllable

noun

  • A word or metrical foot of three syllables.

    • ‘When the word ‘scientist’ was first spoken in 1833, it was meant as a joke: its coinage first drew laughs and later was attacked as ‘an American barbarous trisyllable.’’
    • ‘The signal of the middle syllable of each trisyllable pronunciation is then extracted to make a synthesis unit.’
    • ‘A disyllable or disyllabic word has two syllables, a trisyllable or trisyllabic word has three.’
    • ‘A disyllable consists of two syllables, and a trisyllable of three.’
    • ‘Exercises involving spondees and trisyllables in isolation and in simple sentences, as well as picture-based sentence identification exercises are included.’

Pronunciation:

trisyllable

/trʌɪˈsɪləb(ə)l/