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A strongly emetic active principle obtained from several species of Andromeda and Rhododendron (family Ericaceae); it is a cardiac poison, first stimulating and then paralyzing the vagus; it also paralyzes the motor nerve ends in striated muscle.
the toxin found in members of the plant family Ericaceae, including azaleas, rhododendron. Ingestion by ruminants causes salivation, colic, vomiting, staggering, collapse, death. Called also grayanotoxin.