rhiant

Welsh

Backformation from the plural/collective rhieni (from rhy- (“before”) +‎ geni (“birth”)) with the suffix -ant, -aint.

rhiant m (plural rhieni or rhiaint)

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