English 'ambulance' comes from French 'hôpital ambulant' (walking hospital), from Latin 'ambulāre' (to walk) — born in Napoleon's wars when surgeon Dominique Larrey invented mobile surgical units that followed troops into battle.
A vehicle equipped for taking sick or injured people to and from hospital, especially in emergencies.
From French 'ambulance,' short for 'hôpital ambulant' (walking hospital, mobile hospital), from Latin 'ambulāre' (to walk, to move about), from PIE *h₂m̥bʰi- (around) + *h₂el- (to wander, to go). The term was coined during the Napoleonic Wars, when Dominique Jean Larrey, Napoleon's chief surgeon, devised 'ambulances volantes' (flying ambulances) — horse-drawn wagons that moved directly behind the battle lines to collect and treat wounded soldiers rather than waiting for the battle to end. Key roots: *h₂el- (Proto-Indo-European: "to wander, to go"), ambulāre (Latin: "to walk, to go about").
The ambulance began as a hospital that moved toward the wounded, not a vehicle that carried them away. Larrey's 'ambulances volantes' (flying ambulances) were surgical units on wheels that followed the battle — surgeons operated under fire. The modern ambulance inverted this: it carries the patient to the hospital rather than bringing the hospital to the patient.