n. 多音节词

[ noun ]
a word of more than three syllables
<noun.communication>

Polysyllable \Pol"y*syl`la*ble\, n. [Poly- + syllable.]
A word of many syllables, or consisting of more syllables
than three; -- words of less than four syllables being called
{monosyllables}, {dissyllables}, and {trisyllables}.