Where does “crithnaigid” come from?

crithnaigid (Old Irish) comes from Old Irish crith, from Proto-Celtic kritos — trembling, fever.

Ancestry of “crithnaigid”, step by step

StepLanguageWordMeaning
1Old Irishcrithshaking, trembling
2Proto-Celtickritostrembling, fever
Every word from Proto-Celtic kritos →Every word from Old Irish crith →