Welsh

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Etymology

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pymtheg (fifteen) +‎ nos (night)

Pronunciation

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Noun

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pymthegnos m or f (plural pymthegnosau)

  1. (archaizing) Alternative form of pythefnos

Mutation

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Welsh mutation
radical soft nasal aspirate
pymthegnos bymthegnos mhymthegnos phymthegnos
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.