1. A treatment that enhances an existing medical regimen, as a pharmacological agent added to a drug to increase or aid its effect.
2. An immunological agent that increases the antigenic response.
1. Contributing to or enhancing an existing medical regimen: adjuvant chemotherapy.
2. or ad·ju·vant·ed (ăjə-vən-tĭd) Containing an adjuvant: an adjuvant vaccine.
[From Latin adiuvāns, adiuvant-, present participle of adiuvāre, to help; see AID.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.