The Collaborative International Dictionary of English v.0.48:

Coadjuvant \Co*ad"ju*vant\, a.
   Cooperating.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coadjuvant \Co*ad"ju*vant\, n. (Med.)
   An adjuvant.
   [1913 Webster]