Where does “-igid” come from?

-igid (Middle Irish) comes from Old Irish -igidir, from Proto-Celtic *-sagyetor — denominative/causative suffix.

Ancestry of “-igid”, step by step

StepLanguageWordMeaning
1Old Irish-igidira suffix used to form verbs from nouns and...
2Proto-Celtic*-sagyetordenominative/causative suffix
Every word from Proto-Celtic *-sagyetor →Every word from Old Irish -igidir →