castor oil 名詞
Cas·tor oil A mild cathartic oil, expressed or extracted from the seeds of the Ricinus communis, or Palma Christi. When fresh the oil is inodorous and insipid.
Castor-oil plant. Same as Palma Christi.
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castor oil
n : a purgative extracted from the seed of the castor plant;
used in paint and varnish as well as medically