One of the mysteries of the English language finally explained.
Treated as plural. Springs of cold, sour-tasting mineral waters.
Late 17th century; earliest use found in Edward Browne (1644–1708), physician and traveller. From classical Latin Acidulae, plural of Acidula, name of a spring near Teanum Sidicinum (modern Teano) in northern Campania in Italy (Pliny), use as name (short for aqua acidula sour water) of feminine of acidulus slightly sour.
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