1. badius — de Vaan
badius 'brown, chestnut coloured (of horses)' [adj, o/a] (Varro-l·; rare) Pit. *bopjo-. The presence of di in badius suggests an original voiced aspirate (as in medius), since PIE *di would have yielded ii (as in peior). The Latin word can be connected with Olr. buide 'yellow' < PCI. *bodrio-. The limited distribution and initial *b- render PIE origin unlikely» If we assume a preform *bac?ios9 the Irish word must … — [de Vaan, s.v. badius, p. 81]