noun / adjective
adjunct
AJ-ungkt/ˈædʒʌŋkt/
An additional person or thing serving a supporting role.
The removable basket serves as a useful adjunct to the bicycle.

Etymology
The original image is of something joined onto another thing. In English, this became an added component that supports the main thing without being essential to it.
In context
they're also looking at other ways to be able to have as an adjunct to surgery historically they've used local anesthetic
More examples
- She teaches two evening courses as an adjunct.
- The college hires several adjunct instructors each semester.
- Maps are useful adjuncts to a written route description.
Forms
adjunct · adjuncts
Similar words
- supplement
- Usually names added material rather than a supporting person.
- assistant
- Specifically names someone who helps another person with work.