Where does “-iú” come from?

-iú (Irish) comes from Irish -adh, from Old Irish -ad, from Proto-Celtic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

-iú (Irish): slender form of -ú

Definitions

  1. slender form of -ú

Ancestry of “-iú”, step by step

StepLanguageWordMeaning
1Irish-adhCreates the regular verbal noun of...
2Old Irish-adsuffix forming verbal nouns; suffix forming the...
3Proto-Celtic-tusForms action nouns from verb stems
4Proto-Indo-European-tusDerives action nouns from verb roots
Every word from Proto-Indo-European -tus →Every word from Irish -adh →Every word from Old Irish -ad →