rheidiol

Welsh

Etymology

From rhaid +‎ -iol.

Adjective

rheidiol (feminine singular rheidiol, plural rheidiol, equative mor reidiol, comparative mwy rheidiol, superlative mwyaf rheidiol)

1. necessary, required

Mutation

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