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Use "trisyllabic" in a sentence
"That verse wherein the accent falls on every third syllable, may be called trisyllabic verse; it is equivalent to what has been called anapestic; and we will still use the term anapest to express two unaccented and one accented syllable."
"He wrote the book, and much of the rest of his life's work, in rhyming anapestic meter, also called trisyllabic meter."
"Plus, it just sounds better as a trisyllabic epithet."