Definition of trisyllabic in English:

trisyllabic

adjective

  • See trisyllable

    • ‘A disyllable or disyllabic word has two syllables, a trisyllable or trisyllabic word has three.’
    • ‘Resolutely accentualist in his outlook, he argued in a series of ‘Letters,’ that trisyllabic feet, whether dactylic or anapaestic, are fully congenial to English, ‘in spite of the Antijacobin’.’
    • ‘Treeswifts calls have been described as a squeal, with a few syllables grouped together to form a disyllabic or trisyllabic call.’

Pronunciation

trisyllabic

/trʌɪsɪˈlabɪk/