soap plant

noun
  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.

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

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Historical Examples of soap plant