One of the mysteries of the English language finally explained.
Each of the five possible isomers produced by the double hydrogenation of pyridine; C₅H₇N. Also: any of various compounds derived from these; especially any of a class of drugs derived from 1,4-dihydropyridine (in which the nitrogen and the carbon opposite to it in the pyridine ring are hydrogenated), which act as calcium channel blockers and are used chiefly for the treatment of hypertension and angina pectoris.
Late 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From dihydro- + pyridine, after German Dihydropyridin.
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