One of the mysteries of the English language finally explained.
Attributive Designating earthenware, china, glaze, etc., produced on the estate of the second Marquess of Rockingham at Swinton, South Yorkshire, from 1745 to 1842, or products, especially tea services, resembling these in style. Frequently in "Rockingham ware". Also absol.: china or earthenware of this kind.
Mid 19th century; earliest use found in Era. From the title of Charles Watson-Wentworth, second Marquis of Rockingham, on whose estate such products were produced.
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