Definition of Castile soap in English:

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Castile soap

noun

Fine, hard white or mottled soap made with olive oil and sodium hydroxide.
Example sentences
  • Often based on pure Castile soap, natural shampoos are usually combined with high-quality herbs and plant oils that leave your hair and scalp healthier.
  • Because of its mildness, Castile soap became the soap of choice for babies and those with sensitive skin.
  • Our soaps are made using a traditional Castile soap formula from the 19th century.

Origin

Late Middle English: named after Castile in Spain, where it was originally made.

For editors and proofreaders

Syllabification: Cas·tile soap

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