early 13c., "fragrant substance, spice" (a sense now obsolete), from Latin aroma "sweet odor," from Greek aroma "seasoning, a spice or sweet herb," which is of unknown origin. The meaning "fragrance, odor," especially an agreeable one, is from 1814. A hypercorrect plural is aromata. Related: Aromal.
1846, "medical treatment of disease," from Modern Latin therapia, from Greek therapeia "curing, healing, service done to the sick; a waiting on, service," from therapeuein "to cure, treat medically," literally "attend, do service, take care of" (see therapeutic).
<a href="https://www.etymonline.com/word/aromatherapy">Etymology of aromatherapy by etymonline</a>
Harper, D. (n.d.). Etymology of aromatherapy. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/aromatherapy