noun Usage: often capitalized C Etymology: Middle English castell sope, from Castell Castile Date: 15th century a fine hard bland soap made from olive oil and sodium hydroxide
CASTILE SOAP
Meaning of CASTILE SOAP in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012