Ambulance

A special vehicle used to take sick or injured people to hospital [Cambridge Online Dictionary].
A vehicle equipped for transporting the injured or sick [Merriam-Webster Online Dictionary].
An ambulance is a vehicle for taking people to and from the hospital [Collins Online Dictionary].
A specially equipped vehicle is used to transport the sick or injured.
French, from (hôpital) ambulant, mobile (hospital), from Latin ambulāns, ambulant-, present participle of ambulāre, to walk [The Free Dictionary].
a specially equipped motor vehicle, airplane, ship, etc., for carrying sick or injured people, usually to a hospital;
(formerly) a field hospital.

Sources:

Ambulance. Dictionary.com. Retrieved from: https://www.dictionary.com/browse/ambulance

Ambulance. The Free Dictionary. Retrieved from: https://www.thefreedictionary.com/ambulance

Ambulance. Collins Online Dictionary. Retrieved from: https://www.collinsdictionary.com/dictionary/english/ambulance

Ambulance. Merriam-Webster Online Dictionary. Retrieved from: https://www.merriam-webster.com/dictionary/ambulance

Ambulance. Cambridge Online Dictionary. Retrieved from: https://dictionary.cambridge.org/dictionary/english/ambulance