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Castile soap

Castile soap
  (kəˈstiːl ˈsəʊp)
  Formerly castle-soap.
  [from Castile, a province of Spain, in which the soap was originally made.]
  A fine hard soap made with olive-oil and soda. There are two kinds, the white and the mottled. Called also Spanish soap.

1616 B. Jonson Devil an Ass v. iii, Foam at the mouth. A little castle-soap Will do't to rub your lips. 1641 French Distill. (1651) v. 153 You may make candles of Castle-sope. 1710 Lond. Gaz. No. 4674/7 Castile marbled Soap. 1712 Addison Spect. No. 458 ¶1 A word or two upon the present Duties on Castle-soap. 1766 Entick London IV. 86 White soap in hard cakes, called Castile soap. 1866 Mrs. J. H. Riddell Race for W. xxix, Like Castile soap..generally mottled.

Oxford English Dictionary

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