Also found in: Medical, Wikipedia.
Related to grayanotoxin: Andromedotoxin


A neurotoxin found in the nectar of certain rhododendrons and related plants, such as some laurels of the genus Kalmia, and in unpasteurized honey produced from such nectar, and causing temporary effects such as nausea, vomiting, dizziness, and irregular heartbeat if ingested.

[New Latin (Leucothoē) grayāna, species name (after Asa Gray) + toxin.]
References in periodicals archive ?
Mad honey poisoning occurs after people consume honey contaminated with grayanotoxin, a chemical contained in nectar from the Rhododendron species ponticum and luteum.
The cause of the poisoning is the toxin known as grayanotoxin found in honey obtained from the nectar of Rhododendron ponticum species growing naturally on the mountains in the region.
The cause of the intoxication is the grayanotoxin which has toxic effects on sodium channels (2) and induces increased parasympathetic tone that causes life-threatening bradycardia, hypotension, and altered mental status (3).
pungens forests within the Great Smoky Mountains National Park, soaked in deionized water, and filtered to obtain extracts that probably included water-soluble grayanotoxins, a potential allelochemical common in members of the Ericaceae.
Add a little honey for sweetness, but beware the maddening aftermath -- if that honey is contaminated with compounds called grayanotoxins.