Bornean /ˈbɔː(ɹ)niən/adjective 1noun 1forms 1 adjective1 •From, or pertaining to, Borneo.To him it seemed that the Bornean rainforests, the tallest on Earth, were places that had: 'remained untouched and unchanged since remote geological epochs[.]' — 2018 noun1 •Someone from Borneo. formsBorneans