The Collaborative International Dictionary of English v.0.48:

Insuccation \In`suc*ca"tion\, n. [L. insucare, insucatum, to
   soak in; pref. in- + succus, sucus, sap.]
   The act of soaking or moistening; maceration; solution in the
   juice of herbs. [Obs.] --Coxe.
   [1913 Webster]

         The medicating and insuccation of seeds. --Evelyn.
   [1913 Webster]