rachiotomy (rā-kĭ-ŎT-ŏ-mē): Incision into the vertebral column.

rachischisis (ră-KĬS-kĭ-sĭs): Fissure of vertebral column.

radial (RĀD-ē-ăl): Pertaining to radius.

radicotomy (răd-ĭ-KŎT-ō-mē): Incision into a nerve root.

radiculitis (ră-dĭk-ū-LĪ-tĭs): Inflammation of the nerve roots.

radiculopathy (ră-dĭk-ū-LŎP-ă-thē): Disease of the nerve roots.

radiography (rā-dē-OG-ră-fē): Process of recording x-rays.

radiologist (rā-dē-ŎL-ō-jĭst): Physician who specializes in the diagnosis and treatment of disease using medical imaging.

radiology (rā-dē-ŎL-ō-jē): Study of the use of radiant energy in diagnosing disease.

rebel: Word part that does not fit within the language rules.

rectal (RĔK-tăl): Pertaining to the rectum.

rectocele (REK-tŏ-sēl): Protrusion of the rectum.

reflux (RĒ-flŭks): Abnormal backward flow.

renogram (RĒ-nŏ-gram): Radiographic record of the kidney.

respiratory zone (rĕs-PĪR-ă-tō-rē zōn): The respiratory zone includes structures that are directly involved in gas exchange.

respirologist (res-pĭ-ROL-ŏ-jĭst): Specialist who studies and treats disease and disorders related to breathing.

respirology (rĕs-pĭr-ŎL-ŏ-jē): The study of breathing disorders and disease.

response (ri-SPONS): Nervous system function that causes a target tissue (muscle or gland) to produce an event as a consequence to stimuli.

reticulated (rĕ-TIK-yŭ-lāt-ĕd): Net like.

retinal (RĔT-ĭ-năl): Pertaining to the retina.

retinoblastoma (ret-ĭn-ō-blas-TŌ-mă): Tumor arising from a developing retinal cell.

retinopathy (ret-ĭn-OP-ă-thē): Disease of the retina.

retinoscopy (ret-ĭn-OS-kŏ-pē): Process of viewing the retina.

retrograde urogram (RE-trō-grād Ū-rō-grăm): Radiographic image of the urinary tract.

rhabdomyolysis (rab-dō-mī-OL-ĭ-sĭs): Dissolution of a striated muscle.

rheumatoid arthritis (ROO-mă-toyd ar-THRĪT-ĭs): An autoimmune disorder in which the body mounts an immune response against its own joint tissues, causing inflammation and damage to the joints.

rhinitis (rī-NĪ-tĭs): Inflammation of the nasal cavity which can lead to rhinorrhea.

rhinomycosis (rī-nō-mī-KŌ-sĭs): Abnormal condition of fungus in the nose.

rhinoplasty (RĪ-nō-plăs-tē): Surgical repair of the nose.

rhinorrhagia (rī-nō-RĀ-jē-ă): Rapid flow of blood from the nose.

rhinorrhea (rī-nŏ-RĒ-ă): Excessive flow or discharge from the nasal cavity (runny nose).

rhizomeningomyelitis (rī-zō-mĕ-nĭn-gō-mī-ĕ-LĪ-tĭs): Inflammation of the nerve root, meninges and spinal cord.

rhizotomy (rī-ZŎT-ō-mē): Incision into a nerve root.

rhytidectomy (rit-ĭ-DEK-tŏ-mē): Excision of the wrinkles.

rhytidoplasty (RĬT-ĭ-dō-plăs-tē): Surgical repair of wrinkles.

rickets (RIK-ĕts): A painful condition in children where bones are misshapen due to a lack of calcium, causing bow leggedness.

right lymphatic duct (rīt lim-FAT-ik dŭkt): Drains lymph fluid from the upper right side of body into the right subclavian vein.

robotic surgery (rō-BŎ- tĭk SŬRJ-ĕ-rē): Use of small surgical instruments attached to a computer and operated by the surgeon from a console several feet from the operating table.

roots of the great vessels: The part of each great vessel (aorta, pulmonary trunk, inferior vena cava, superior vena cava) that connects to the base of the heart.