GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Saponaceous , a. [L. sapo, -onis, soap, of Teutonic origin, and akin to E. soap. See Soap.] Resembling soap; having the qualities of soap; soapy.
   1913 Webster
   ☞ Saponaceous bodies are compounds of an acid and a base, and are in reality a kind of salt.
   1913 Webster