ambulance (n.)youdaoicibaDictYouDict
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.)youdaoicibaDictYouDict
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.
coagulant (n.)youdaoicibaDictYouDict
1770, from Latin coagulantem (nominative coagulans), present participle of coagulare (see coagulate).
petulant (adj.)youdaoicibaDictYouDict
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.)youdaoicibaDictYouDict
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.)).
stimulant (adj.)youdaoicibaDictYouDict
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.)youdaoicibaDictYouDict
1830, from Latin undulantem (nominative undulans), from unda "wave" (see water (n.1)).
pustulantyoudaoicibaDictYouDict
"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.
noctambulantyoudaoicibaDictYouDict
"That walks or moves about at night; somnambulant", Late 17th cent. From nocti- + classical Latin ambulant-, ambulāns, present participle of ambulāre to walk.