Definition of saponaceous in US English:

saponaceous

adjective

  • Of, like, or containing soap; soapy.

    • ‘Its root is saponaceous, and is pounded into a pulp and used instead of soap by the natives.’
    obsequious, servile, sycophantic, flattering, ingratiating, unctuous, oleaginous, oily, toadyish, slavish, bowing and scraping, grovelling, abject, crawling, creeping, cringing, prostrate, uriah heepish
    View synonyms

Origin

Early 18th century: from modern Latin saponaceus (from Latin sapo, sapon- ‘soap’) + -ous.

Pronunciation

saponaceous

/ˌsapəˈnāSHəs//ˌsæpəˈneɪʃəs/