Adjective adjuvant has 2 senses
- accessory, adjunct, ancillary, adjuvant, appurtenant, auxiliary, subsidiary - relating to something that is added but is not essential; "an ancillary pump"; "an adjuvant discipline to forms of mysticism"; "The mind and emotions are auxilliary to each other"
 Antonym:  unsupportive (indirect, via supportive)
 
- adjuvant - enhancing the action of a medical treatment; "the adjuvant action of certain bacteria"
 Antonym:  unhelpful (indirect, via helpful)
 
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Noun adjuvant has 1 sense
- adjuvant - an additive that enhances the effectiveness of medical treatment
 --1 is a kind of additive
 
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