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Definition of ECHINACEA
: the dried rhizome, roots, or other parts of any of three purple coneflowers that are used primarily in dietary supplements and herbal remedies for the stimulating effect they are held to have on the immune system; also: any of these herbs
: the dried rhizome, roots, or other part of any of three composite herbs (Echinacea angustifolia,E. pallida, and E. purpurea) that were formerly listed in the United States Pharmacopeia, that are now used primarily in dietary supplements and herbal remedies, and that are held to stimulate the immune system; also: any of these herbs—see purple coneflower
Any member of the coneflower genus Echinacea. Commonly called the purple coneflower, echinacea is used as a border plant. The leaves and roots are used in herbal remedies to boost the immune system and in the treatment of colds and flu.