• Webster's Revised Unabridged Dictionary
    • n Buchu (Bot) A South African shrub (Barosma) with small leaves that are dotted with oil glands; also, the leaves themselves, which are used in medicine for diseases of the urinary organs, etc. Several species furnish the leaves.
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Century Dictionary and Cyclopedia
    • n buchu The leaves of several species of Barosma, shrubby plants at the Cape of Good Hope, having an aromatic taste and penetrating odor, and extensively used in medicine for various disorders of the stomach and urinary organs. See Barosma.
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In literature:

Columbian spirits, caramel, cinnamon and cardamom, and a touch of the buchu.
"The Clarion" by Samuel Hopkins Adams
Of the diuretics, queen of the meadow, buchu, and digitalis generally operate well.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
The British Pharmacopoeia contains an infusion and tincture of buchu.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
They are all good, but buchu is the best.
"Outa Karel's Stories" by Sanni Metelerkamp
Some practitioners state that they have found buchu beneficial.
"A System of Practical Medicine by American Authors, Vol. I" by Various