One of the mysteries of the English language finally explained.
A glycosidal resin obtained from the seeds of a morning glory, Ipomoea (formerly Pharbitis) nil, to which their purgative properties were formerly attributed.
Late 19th century; earliest use found in The New Sydenham Society's Lexicon of Medicine and the Allied Sciences. From scientific Latin † Pharbitis, former genus name + -in.
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