The proper spelling of the word "bibiru" is actually "biru" in the Bahasa Indonesia language. The incorrect spelling likely stems from a mishearing or mispronunciation of the word. In IPA phonetic transcription, "biru" is pronounced as /bi.ɾu/. This represents the sounds of "bee" and "roo" without the "d" sound often added by English speakers. Careful attention to pronunciation and spelling can go a long way in mastering a foreign language.
Bebeeru.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.