Webster's Revised Unabridged Dictionary · 1913

Ambulance

Ambulance ({not transcribed}) , noun

[French ambulance, hôpital ambulant, from Latin ambulare to walk. See Amble.]

(a)
(Military) A field hospital, so organized as to follow an army in its movements, and intended to succor the wounded as soon as possible. Often used adjectively; as, an ambulance wagon; ambulance stretcher; ambulance corps.
(b)
(Military) An ambulance wagon or cart for conveying the wounded from the field, or to a hospital.