Welsh edit

Etymology edit

From (house) +‎ *dynn (hill, height).

Noun edit

tyddyn m (plural tyddynnod or tyddynnau)

  1. farm holding

Mutation edit

Welsh mutation
radical soft nasal aspirate
tyddyn dyddyn nhyddyn thyddyn
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.