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castoreum (countable and uncountable, plural castoreums)

  1. The bitter exudate of the castor sacs of mature beavers.
    • 1835 November 28, Jon Pereira, Lectures on Materia Medica, or Pharmacology, and General Therapeutics: Lecture IX: On Castoreum, London Medical Gazette, Volume 17, page 299,
      One of the substances tried was castoreum. [] If I were to judge from my own experience, I would say castoreum has very little therapeutic power, for I have not seen much benefit from its employment in those cases to which this remedy is said to be adapted.
    • 1999, L. Sun, D. Müller-Schwarze, Chemical Signals in the Beaver: One Species, Two Secretions, Many Functions?, Robert E. Johnston, Dietland Müller-Schwarze, Peter W. Sorenson (editors), Advances in Chemical Signals in Vertebrates, page 284,
      While the role of castoreum as a means of territorial advertisement has been extensively investigated and supported, the possibility of coding for sex information has not yet been excluded.
    • 2004, Christian V. Stevens, Roland Verhé, Renewable Bioresources: Scope and Modification for Non-Food Applications, page 257,
      Synthetic castoreums are now available, and can be as good as the natural fragrant[sic].
  2. (archaic) A hat made from beaver fur.


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