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mustard oil

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noun
  1. oil expressed from the seed of mustard, used chiefly in making soap.

Origin of mustard oil

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for mustard oil

mustard oil

noun
  1. an oil that is obtained from mustard seeds and used in making soap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012