ancillary
1. [ adjective ] relating to something that is added but is not essential
Synonyms: adjunct adjuvant appurtenant auxiliary subsidiary accessory
Examples:

"an ancillary pump" "an adjuvant discipline to forms of mysticism" "The mind and emotions are auxilliary to each other"

Related terms: supportive
Similar spelling:   Anguilla
  Angila
  Anguillula
  Angella
  angularity
  angular
  Anguillan
  angiology
  anaclinal
  Ansell
  Angell
  anxiolytic
  Angola
  Angelle
  Angela