WordReference Random House Unabridged Dictionary of American English © 2019
ad•ju•vant  (ajə vənt),USA pronunciation adj. 
  1. serving to help or assist;
  2. Medicineutilizing drugs, radiation therapy, or other means of supplemental treatment following cancer surgery.

  1. a person or thing that aids or helps.
  2. Medicineanything that aids in removing or preventing a disease, esp. a substance added to a prescription to aid the effect of the main ingredient.
  3. Immunologya substance admixed with an immunogen in order to elicit a more marked immune response.
  • Latin adjuvant- (stem of adjuvāns, present participle of adjuvāre), equivalent. to ad- ad- + juv- (stem of juvāre to help) + -ant- -ant
  • 1600–10

Collins Concise English Dictionary © HarperCollins Publishers::

adjuvant /ˈædʒəvənt/ adj
  1. aiding or assisting
  1. something that aids or assists; auxiliary
Etymology: 17th Century: from Latin adjuvāns, present participle of adjuvāre, from juvāre to help

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