Revalenta arabica
Encyclopedia
Revalenta Arabica is a name given to a preparation which was sold in the 18th century as an empirical diet for invalids, extraordinary restorative virtues being attributed to it. It was, in reality, only a preparation of the common lentil
Lentil
The lentil is an edible pulse. It is a bushy annual plant of the legume family, grown for its lens-shaped seeds...

, its first name being formed for disguise by the transposition of its earlier botanical name
Botanical name
A botanical name is a formal scientific name conforming to the International Code of Botanical Nomenclature and, if it concerns a plant cultigen, the additional cultivar and/or Group epithets must conform to the International Code of Nomenclature for Cultivated Plants...

, Ervum lens. Its real value was about equal to good pea-meal.
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