Ancillary
Part of speech: adjective
Definition: Subordinate; secondary; auxiliary; accessory.
Part of speech: noun
Definition: Something that serves an ancillary function, such as an easel for a painter. An auxiliary; a subordinate.
Adjuvant
Part of speech: noun
Definition: A thing which aids or assists; an auxiliary.One who helps or facilitates; an assistant.An additive (as in a drug) that aids or modifies the action of the principal ingredient.Something (as in a method) that enhances the effectiveness of a medical treatment.A substance enhancing the immune response to an antigen.
Part of speech: adjective
Definition: The noun used as a modifier.