iach

Irish

iach m

Irish mutation
Radical	Eclipsis	with h-prothesis	with t-prothesis
iach	n-iach	hiach	not applicable
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

iach

Mutated forms of *iach*
Radical	Soft	Nasal	H-prothesis
iach	unchanged	unchanged	hiach

Note: Certain mutated forms of some words can never occur in standard Middle Welsh.
All possible mutated forms are displayed for convenience.

ïach

Old Irish mutation
Radical	Lenition	Nasalization
ïach (pronounced with /h/ in h-prothesis environments)	unchanged	n-ïach
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

iach

iach

From Middle Welsh yach, from Proto-Celtic *yekkos. Cognate with Breton yac'h, Cornish yagh, and Gaulish Iaccus (personal name). Perhaps cognate with Old Irish ícc (“cure, healing”).

iach (feminine singular iach, plural iach, equative iached, comparative iachach, superlative iachaf)

Mutated forms of *iach*
radical	soft	nasal	h-prothesis
iach	unchanged	unchanged	hiach

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “iach”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies