- a Californian plant, Chlorogalum pomeridianum, of the lily family, the bulb of which was used by the Indians as a soap.
- any of various other plants having parts that can be used as a soap.
Origin of soap plant
An Americanism dating back to 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for soap plant
The "soap-plant" (amole) is one which appears to be among the most serviceable.What I Saw in California</p>
The leaves of the soap-plant have been with us all the spring, increasing in length as the season has advanced.
This is not the only plant popularly known as soap-plant among us.
There was a stir in the soap-plant outside and Marvin emerged, hurried around to the door, and entered the cabin.Lightnin'