Welsh

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Etymology

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From deddf (statute) +‎ llyfr (book).

Noun

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deddflyfr m (plural deddflyfrau)

  1. statute book

Mutation

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Welsh mutation
radical soft nasal aspirate
deddflyfr ddeddflyfr neddflyfr unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.