Sap″o‐nul (?), n. [F. saponule, fr. L. sapo, -onis, soap.] (Old Chem.) A soapy mixture obtained by treating an essential oil with an alkali; hence, any similar compound of an essential oil. [Written also saponule.]
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.