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ambulance: ambulance: [19] Originally, ambulance was a French term for a field hospital – that is, one set up at a site convenient for a battlefield, and capable of being moved on to the next battlefield when the army advanced (or retreated). In other words, it was an itinerant hospital, and the ultimate source of the term is the Latin verb ambulāre ‘walk’ (as in amble). The earliest recorded term for such a military hospital in French was the 17th-century hôpital ambulatoire.

This was later replaced by hôpital ambulant, literally ‘walking hospital’, and finally, at the end of the 18th century, by ambulance. This sense of the word had died out by the late 19th century, but already its attributive use, in phrases such as ambulance cart and ambulance wagon, had led to its being used for a vehicle for carrying the wounded or sick.
=> acid, alacrity, amble, perambulator
petulant: petulant: see repeat
ambulance (n.): 1798, "mobile or field hospital," from French (hôpital) ambulant, literally "walking (hospital)," from Latin ambulantem (nominative ambulans), present participle of ambulare "to walk" (see amble).
AMBULANCE, s. f. a moveable hospital. These were houses constructed in a manner so as to be taken to pieces, and carried from place to place, according to the movements of the army; and served as receptacles in which the sick and wounded men might be received and attended. ["Lexicographica-Neologica Gallica" (The Neological French Dictionary), William Dupré, London, 1801]
The word was not common in English until the meaning transferred from "field hospital" to "vehicle for conveying wounded from field" (1854) during the Crimean War. In late 19c. U.S. the word was used dialectally to mean "prairie wagon." Ambulance-chaser as a contemptuous term for a type of lawyer dates from 1897.
ambulant (adj.): 1610s, from Latin ambulantem (nominative ambulans), present participle of ambulare (see amble). Of diseases, denoting cases in which the patient may be up and around, by 1913.
anticoagulant: 1905, adjective and noun, from anti- + coagulant.
coagulant (n.): 1770, from Latin coagulantem (nominative coagulans), present participle of coagulare (see coagulate).
petulance (n.): c. 1600, "insolence, immodesty," from French pétulance (early 16c.), from Latin petulantia "sauciness, impudence," noun of quality from petulantem (see petulant). Meaning "peevishness" is recorded from 1784, from influence of pettish, etc. It displaced earlier petulancy (1550s).
petulant (adj.): 1590s, "immodest, wanton, saucy," from Middle French petulant (mid-14c.), from Latin petulantem (nominative petulans) "wanton, froward, saucy, insolent," present participle of petere "to attack, assail; strive after; ask for, beg, beseech" (see petition (n.)). Meaning "peevish, irritable" first recorded 1775, probably by influence of pet (n.2). Related: Petulantly.
postulant (n.): 1759, from French postulant "applicant, candidate," literally "one who asks," from Latin postulantem (nominative postulans), present participle of postulare "to ask, demand" (see postulate (v.)).
solvitur ambulando: an appeal to practical experience for a solution or proof, Latin, literally "(the problem) is solved by walking," originally in reference to the proof by Diogenes the Cynic of the possibility of motion.
somnambulance (n.): 1825; see somnambulant + -ance.
somnambulant: 1819 (n.); 1832 (adj.); see somnambulism + -ant.
stimulant (adj.): 1772, from French stimulant or directly from Latin stimulantem (nominative stimulans), present participle of stimulare "to prick, urge, stimulate" (see stimulation). As a noun from 1794.
undulant (adj.): 1830, from Latin undulantem (nominative undulans), from unda "wave" (see water (n.1)).
anovulant: "(Chiefly of a drug) preventing ovulation", 1960s: from an-¹ + ovul(ation) + -ant.
pustulant: "Originally: causing the formation of pustules (now rare ). Later: affected with pustules; pustular", Mid 19th cent. From post-classical Latin pustulant-, pustulans, present participle of pustulare.
noctambulant: "That walks or moves about at night; somnambulant", Late 17th cent. From nocti- + classical Latin ambulant-, ambulāns, present participle of ambulāre to walk.
simulant: "A thing which simulates or resembles something else", Mid 18th century: from Latin simulant- 'copying, representing', from the verb simulare.