RBR - Relative Bed Rest. Medical RBR abbreviation meaning defined here. What does RBR mean? Get the full information of RBR acronym / abbreviation / slang definitions at AcronymsandSlang. The meaning of RBR is Rule-Based Reasoning and other meanings are located at the bottom which take place within Medical terminology and RBR has 7. PDF | Multiple disorders are a daily problem in medical diagnosis and treatment, but most expert systems.