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. 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).
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Definitions of aromatherapy
the therapeutic use of aromatic plant extracts and essential oils in baths or massage;