Where does “oireamh” come from?

oireamh (Middle Irish) comes from Old Irish áirem, from Old Irish ad·rími, from Proto-Celtic rīmā, from Proto-Indo-European h₂rey-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.

Ancestry of “oireamh”, step by step

StepLanguageWordMeaning
1Old Irisháirem—
2Old Irishad·rímicounts, numbers, computes; records, recounts,...
3Proto-Celticrīmānumber
4Proto-Indo-Europeanh₂rey-to count, count out; to arrange
5Proto-Indo-Europeanh₂er-to fit, to fix, to put together

Words derived from “oireamh”

Every word from Proto-Indo-European h₂er- →Every word from Proto-Indo-European h₂rey- →Every word from Proto-Celtic rīmā →