Etymology
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saponaceous (adj.)

"soapy, resembling soap," 1710, from Latin sapo, sapon (see soap (n.)) + -aceous. In mid-19c. jocular use for "slippery, unctuous" in figurative senses (1837). Related: Saponacity

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Definitions of saponaceous

saponaceous (adj.)
resembling or having the qualities of soap;
Synonyms: soapy
From wordnet.princeton.edu