trimeter
noun/ˈtrɪmɪtə(r)/, /ˈtraɪmɪtə(r)/
/ˈtrɪmɪtər/
(specialist)- a line of poetry consisting of three sets of syllables called feetWord Originmid 16th cent.: via Latin from Greek trimetros, from tri- ‘three’ + metron ‘measure’.
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trimeter