nostrum \NOS-truhm\ (noun) - 1 : A medicine of secret composition and unproven or dubious effectiveness; a quack medicine. 2 : A usually questionable remedy or scheme; a cure-all.
"He's carrying on his father's trade, for what he has just dispensed to us is very like a nostrum." -- Honoré de Balzac, 'Lost Illusions'
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Nostrum comes from Latin nostrum (remedium), "our (remedy)," from nos, "we."