1. Having one or more syllables in addition to those found in a standard metrical unit or line of verse.
2. Being one of these additional syllables.

hy·per′me·ter (hī-pûr′mĭ-tər) n.
hy′per·met′ri·cal adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
Not only did he write full poemes en prose, but he also created heterometrical poems which are the result of his deliberate intermingling of traditional verses with hypermetrical ones.
(13) "Real acting" is not the ability to observe syllabic precision (in this case, it is easy to imagine an eighteenth-century critic faulting Branagh for taking a hypermetrical pause) but to make a story out of the silence.
Note that the second rhyme in each quatrain is feminine: "SEA-sons" with "REA-sons," and even "SEEN one" with "BEEN one." Does not that hypermetrical, falling syllable bring each observation to a clattering, clownish halt?
On this scansion line 8 remains anomalously hypermetrical, and inescapably so, its first foot a great thumb or superdactyl with four slacks instead of the prescribed two; but this becomes the only special accommodation the prosodist has to make in these three stanzas.
By creating a circular pattern of unmeaning, Samuel Beckett writes "Come and Go" with a lack of signification so great that the language of the play takes on a hyper static (or hypermetrical) nature.
Simon Tresize then calls on a wide variety of works in order to listen more closely to "Debussy's 'rhythmicized rime," teasing out relations between, first, the chronometric rime of Debussy's musical notation and the integral time of his performed music, and second, the interlocking levels of the pulse (or beat), the meter, and the hypermetrical units of Debussy's compositions.
The assumption has been made here that these intervals occur because one or other ictus (metrically strong syllable) is not fulfilled by a word stress, and in the second case because one or other weak syllable carries a hypermetrical stress.
Mrs Bawcutt notes: 'In Ab[erdeen] the line is hypermetrical; M[aitland] which omits lang, is better rhythmically' (p.
Seeing both first and second half-lines with disyllabic anacrusis as part of the long line, and finding that with some classes of sentence particles the other half-line is more often hypermetrical than with others is a major step forward in understanding 'Kuhn's Law', understanding anacrusis, and understanding the long line.
192 produces a hypermetrical line, where F's 'Dowered' could be a monosyllable and thus preserve the pentameter.