rheidiol

Welsh

Etymology

From rhaid +‎ -iol.

Adjective

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

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.