Fenwick - Foley catheter
- First American medical journal
- First American medical school
- first arch cartilage
- first arch syndrome
- first bite syndrome
- first carpometacarpal joint
- first circulation
- first convoluted tubule
- First cranial nerve
- first crus of ansiform lobule
- first degree atrioventricular block
- first degree heart block
- first dentition
- First do no harm
- first filial generation
- first finger
- first generation hybrid
- first head of triceps brachii muscle
- first head of triceps extensor cubiti muscle
- first heart sound
- first incidence rate
- first intention
- first law of thermodynamics
- first line therapy
- first messenger
- first nerve
- first order bends
- first pass radionuclide angiocardiography
- first pass ventriculography
- first pharyngeal arch
- first polar body
- first set phenomenon
- first set rejection
- First stage of labor
- first thoracic ganglion
- first toe
- first ventricle of brain
- first-degree
- first-degree burn
- first-degree frostbite
