Trimetric

trim·e·ter  (trm-tr)

n.

1. A line of verse consisting of three metrical feet.

2. A line of verse consisting of three measures of two feet each, especially one in iambic, trochaic, or anapestic meter in classical prosody.

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[Late Latin, from Latin trimetrus, from Greek trimetros : tri-, tri- + metron, measure; see meter¹.]

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tri·metric (tr-mtrk), tri·metri·cal (-r-kl) adj.