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extrametrical

[ek-struh-me-tri-kuh l]
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adjective Prosody.
  1. containing one or more syllables in addition to those required by the meter: an extrametrical line.

Origin of extrametrical

First recorded in 1860–65; extra- + metrical
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018