saponaceous

Wons puts them through a microphone in a voice hushed, saponaceous, insinuatingly folksy, with an ingratiating "Are yuh listenin'?" or "Isn't that pretty?"

From Time Magazine Archive

The pulp was then washed and made into paper and thereafter dipped in a saponaceous compound.

From Forty Centuries of Ink or, a chronological narrative concerning ink and its backgrounds, introducing incidental observations and deductions, parallels of time and color phenomena, bibliography, chemistry, poetical effusions, citations, anecdotes and curiosa together with some evidence respecting the evanescent character of most inks of to-day and an epitome of chemico-legal ink. by David Nunes Carvalho

Running it down in a north-west direction for seven miles, we were at length stopped by a bank of white saponaceous clay, crossing the valley like a wall.

From Expedition into Central Australia by Charles Sturt

It is a soft, saponaceous substance, not unpleasant to the taste, of a bluish color, and melts in the mouth, like the fat of cold meat, leaving the palate greasy.

From The Poor Scholar Traits And Stories Of The Irish Peasantry, The Works of William Carleton, Volume Three by William Carleton

Some Mexican species produce pods that are boiled and eaten, and certain portions contain saponaceous properties.

From Catalogue of Economic Plants in the Collection of the U. S. Department of Agriculture by William Saunders