[aj-uh-vuh nt]


serving to help or assist; auxiliary.
Medicine/Medical. utilizing drugs, radiation therapy, or other means of supplemental treatment following cancer surgery.


a person or thing that aids or helps.
anything that aids in removing or preventing a disease, especially a substance added to a prescription to aid the effect of the main ingredient.
Immunology. a substance admixed with an immunogen in order to elicit a more marked immune response.

Nearby words

  1. adjutancy,
  2. adjutant,
  3. adjutant bird,
  4. adjutant general,
  5. adjutant stork,
  6. adl,
  7. adlai,
  8. adland,
  9. adler,
  10. adler, alfred

Origin of adjuvant

1600–10; < Latin adjuvant- (stem of adjuvāns, present participle of adjuvāre), equivalent to ad- ad- + juv- (stem of juvāre to help) + -ant- -ant Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for adjuvant

British Dictionary definitions for adjuvant



aiding or assisting


something that aids or assists; auxiliary
med a drug or other substance that enhances the activity of another
immunol a substance that enhances the immune response stimulated by an antigen when injected with the antigen

Word Origin for adjuvant

C17: from Latin adjuvāns, present participle of adjuvāre, from juvāre to help

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

Medicine definitions for adjuvant




A pharmacological agent added to a drug, predictably affecting the action of the drug's active ingredient.
An immunological vehicle for enhancing antigenicity, such as a water-in-oil emulsion in which antigen solution is emulsified in mineral oil.immunoadjuvant

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.