The Collaborative International Dictionary of English v.0.48:

Coadjutant \Co*ad"ju*tant\, a.
   Mutually assisting or operating; helping. --J. Philips.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coadjutant \Co*ad"ju*tant\, n.
   An assistant. --R. North.
   [1913 Webster]