The Oils and Plants Aromatherapy Glossary gives definitions of Aromatherapy and Herbal Terms.

Here are the results for the letter d

Deciduous

Falling away at the close of the growing period.

Decongestant

A medication or treatment, essential oil, plant or herb that breaks up congestion, as of the sinuses, by reducing swelling.

Decongestive

An essential oil capable of reducing congestion

Demulcent

Soothes, softens and allays irritation of mucus membranes.

Depurative

Combats impurity in the blood

Detoxicant

Neutralizing toxic substances

Diuretic

A substance, essential oil, herb or drug that tends to increase the discharge of urine.

Dyscrasia

Bad temper

Dysentery

An inflammatory disorder of the lower intestinal tract, usually caused by a bacterial, parasitic, or protozoan infection and resulting in pain, fever, and severe diarrhea, often accompanied by the passage of blood and mucus.

Dyspepsia

An impairment of the ability to digest food, usually a discomfort aftermeals.