What does adjuvant mean?
The definition of adjuvant
Ad”ju*vant, a.
Etym: [L. adjuvans, p. pr. of adjuvare to aid: cf. F. adjuvant. See Aid.]

Helping; helpful; assisting. [R.] “Adjuvant causes.” Howell.

Ad”ju*vant, n.
1 An assistant. [R.] Yelverton.
2 (Med.)
An ingredient, in a prescription, which aids or modifies the action of the principal ingredient.