-iadur

• -adur

Cf. Latin -ātor.

• (North Wales) IPA^(key): /ˈjadɨ̞r/
• (South Wales) IPA^(key): /ˈja(ː)dɪr/

-iadur m (plural -iaduron)

1. book

   ‎gair (“word”) + ‎-iadur → ‎geiriadur (“dictionary”)

   ‎dydd (“day”) + ‎-iadur → ‎dyddiadur (“diary”)

   ‎blwydd (“year”) + ‎-iadur → ‎blwyddiadur (“yearbook, annual”)

2. instrument

   ‎cyfrifo (“to count, to compute”) + ‎-iadur → ‎cyfrifiadur (“computer”)

   ‎rheoli (“to rule, to regulate”) + ‎-iadur → ‎rheoliadur (“pace maker”)

   ‎cengl (“skein, slip of yarn”) + ‎-iadur → ‎cengliadur (“reel, yarnwindle”)

3. agent suffix; usually added to a verbal root

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