Welsh edit

Etymology edit

From penwythnos (weekend) +‎ -au.

Noun edit

penwythnosau m pl or f pl

  1. plural of penwythnos

Mutation edit

Welsh mutation
radical soft nasal aspirate
penwythnosau benwythnosau mhenwythnosau phenwythnosau
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.