- Radial artery
- Radial artery puncture
- Radial collateral artery
- Radial collateral ligament
- Radial deviation
- Radial fossa
- Radial glial cell
- Radial head
- Radial head fracture
- Radial immunodiffusion
- Radial keratotomy
- Radial nerve
- Radial nerve palsy
- Radial neuropathy
- Radial notch
- Radial recurrent artery
- Radial spoke
- Radial styloid process
- Radial tuberosity
- Radial tunnel syndrome
- Radial veins
- Radiant energy
- Radiant exitance
- Radiant exposure
- Radiant flux
- Radiation
- Radiation burns
- Radiation colitis
- Radiation dermatitis
- Radiation exposure monitoring
- Radiation hormesis
- Radiation intensity
- Radiation monitoring
- Radiation oncologists
- Radiation poisoning
- Radiation proctitis
- Radiation retinopathy
- Radiation shielding
- Radiation therapy
- Radiation-induced cancer
- Radiative transfer equation
- Radical behaviorism
- Radical chemistry
- Radical hysterectomy
- Radical mastectomy
- Radical retropubic prostatectomy
- Radical scavenger
- Radical surgery
- Radicicol
- Radicular artery
- Radicular cyst
- Radicular pain
- Radiculitis
- Radiculopathy
- Radioactive contamination
- Radioactive decay
- Radioactive element
- Radioactive isotopes
- Radioactive material
- Radioactive materials
- Radioactive sources
- Radioactive waste
- Radioactivity
- Radioallergosorbent test
- Radiobinding assay
- Radiobiology
- Radiocarbon dating
- Radiochemistry
- Radiocontrast agent
- Radiofrequency ablation
- Radiogenomics
- Radiographers
- Radiographic anatomy
- Radiography
- Radioimmunoassay
- Radioimmunotherapy
- Radioisotope renography
- Radioisotope therapy
- Radioisotopes
- Radioligand
- Radiologically Isolated Syndrome
- Radiology
- Radiolysis
- Radiometers
- Radiometry
- Radiomics
- Radionuclide angiography
- Radionuclide generator
- Radionuclide imaging
- Radionuclides
- Radiopaque
- Radiopharmaceuticals
- Radioresistance
- Radiosensitivity
- Radiosensitizer
- Radiosurgery
- Radiosynthesis
- Radiotherapy
- Radioulnar joint
- Radithor
- Radium jaw
- Radium-223
- Radius bone
- Radius fracture
- Radius of curvature
- Radon 222
- Radon transform
- Radotinib
- Raf kinase inhibitor protein
- Rafoxanide
- Raftilose
- Rage
- Ragweed
- Raisins
- Raloxifene
- Ralstonia
- Ralstonia pickettii
- Ralstonia solanacearum
- Raltegravir
- Raltitrexed
- Ramachandran plot
- Raman microscopy
- Raman scattering
- Raman spectroscopy
- Ramatroban
- Rambutan
- Ramelteon
- Rami communicantes
- Ramipril
- Ramoplanin
- Ramosetron
- Ramsay Hunt syndrome
- Ramucirumab
- Ramus communicans
- Ramus of the mandible
- Rancho Los Amigos Scale
- Rancidity
- Randle cycle
- Random assignment
- Random blood glucose
- Random coils
- Random dot stereogram
- Random glucose test
- Random hexamer
- Randomization
- Randomized block design
- Randomized controlled trial
- Randomized controlled trials
- Randomized experiment
- Raney Nickel