noun
also ad·vi·sor -zə(r)
( -s )
1. : one that gives advice
served as special adviser to the American delegation
the president's medical advisers
a firm of investment advisers
specifically : one designated to advise students (as in the choice of studies, vocational preparation, or the conduct of research) or to supervise a student organization or activity
the senior English teacher is adviser to the yearbook
2. : an adult leader of a group of horizon clubbers — compare guardian , leader