biolaire

water-cresses, Irish biolar, Early Irish biror, Welsh berwr, Cornish, Breton beler, *beruro-, Latin berula (Marcellus), French berle, So. berro. Possibly allied to the root of Celtic bervô, seethe, Old Irish tipra, well, Gaelic tobar, English burn. Cf. German brunnen kresse, water-cress, i.e. "well" cress. The dictionaries and old glossaries (Cormac, etc.) give bir, bior, as water or well.