
1) Poetic rhythm 2) Welsh poetry
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https://www.crosswordclues.com/clue/cywydd

The cywydd (IPA; plural cywyddau) is one of the most important metrical forms in Welsh traditional poetry (cerdd dafod). There are a variety of forms of the cywydd, but the word on its own is generally used to refer to the cywydd deuair hirion as it is by far the most common type. The first recorded examples of the cywydd date from the early 14th ...
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http://en.wikipedia.org/wiki/Cywydd

Welsh verse form, a kind of short ode in rhyming couplets in which one rhyme is accented and the other unaccented; each line is composed of seven ... [3 related articles]
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http://www.britannica.com/eb/a-z/c/176

(plural, cywyddau) A fourteenth-century metrical form of Welsh lyric poetry consisting of rhyming co
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http://www.encyclo.co.uk/local/22385

Metrical form developed by the Welsh poet Dafydd ap Gwilym which consists of rhyming couplets with seven syllables per line. There are four separate cywydd forms: awdl gywydd, cywydd deuair hirion, cywydd deuair fyrion and cywydd llosgyrnog. See Welsh forms.
Found on
http://www.poetsgraves.co.uk/glossary_of_poetic_terms.htm

a form of meter in Welsh poetry consisting of rhyming couplets, each line having seven syllables: first used in the 14th century.
Found on
https://www.infoplease.com/dictionary/cywydd
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