ïoneiddiad

== Welsh == === Etymology === From ïoneiddio (“to ionise”) +‎ -iad. === Pronunciation === IPA(key): /ˌi.ɔˈnei̯ðjad/ === Noun === ïoneiddiad m (plural ïoneiddiadau) (chemistry, countable) ionisation ==== Usage notes ==== A morphologically derived deverbal noun, such as this entry, is a countable noun. The corresponding uncountable verbal noun is attained in Welsh by employing the verbnoun or dictionary form of the related verb as a masculine singular noun. === See also === === Mutation === === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “ïoneiddiad”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies