Raciology – study of racial differences Radiology – study of X-rays and their medical applications Reflexology – study of reflexes Rhabdology – knowledge or learning concerning divining rods Rhabdology – art of calculating using numbering rods Rheology – science of the deformation or flow of matter Rheumatology – study of rheumatism Rhinology – study of the nose Rhochrematics – science of inventory management and the movement of products Runology – study of runes.