RAAS (renin angiotensin aldosterone system)

RAC (right antecubital)

RACE (rescue, alarm, confine, extinguish (fire safety))

RAD (radiation absorbed dose)

RAD (reactive airway disease)

RAD (rapid applications development)

RAD (right axis deviation)

RADAR (radio detecting and ranging)

RADAR (risk assessment of drugs analysis and response)

RAE (right atrial enlargement)