One of the mysteries of the English language finally explained.
A liquid piperidine derivative, (CH₃)₅C₅H₅NH (1,2,2,6,6-pentamethylpiperidine), which has been used medicinally (usually in the form of its hydrogen tartrate, a white powder) as a ganglion-blocking agent to treat severe hypertension.
1950s; earliest use found in Nature: a weekly journal of science. From pe- (in penta-) + m- + pi- + -dine.
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