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countable and uncountable, plural colchicines
(organic chemistry, pharmacology) A highly toxic alkaloid, chemical formula C22H25NO6, originally extracted from plants of the genus Colchicum and formerly used to treat rheumatic complaints, now used mainly in the treatment of gout. quotations
Gloriosa superba: spectacularly beautiful climbing lily. Roots, stalks, leaves contain an acrid narcotic, superbine, as well as colchicine and choline. Three grains of colchicine are fatal. Hawaii.
1964, Ian Fleming, You Only Live Twice