The Collaborative International Dictionary of English v.0.48:

Eventilate \E*ven"ti*late\, v. t. [L. eventilatus, p. p. of
   eventilare to fan. See Ventilate.]
   1. To winnow out; to fan. [Obs.] --Cockeram.
      [1913 Webster]

   2. To discuss; to ventilate. [Obs.] --Johnson.
      [1913 Webster]