Meaning of soap plant

soap' plant"

Pronunciation: [key]
  1. a Californian plant, Chlorogalum pomeridianum, of the lily family, the bulb of which was used by the Indians as a soap.
  2. any of various other plants having parts that can be used as a soap.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.