Adjuvant

Ad"ju*vant (ăd"j?*vănt), a. [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.