One of the mysteries of the English language finally explained.
In full "Revalenta Arabica". A preparation of lentil and barley flour, sold as a food for invalids.
Mid 19th century; earliest use found in Rambler. Alteration of Ervalenta, the name of a similar preparation from French Ervalenta, irregularly from classical Latin ervum, kind of cultivated vetch + lēnt-, lēns lentil.
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