The Collaborative International Dictionary of English v.0.48:

Ingeminate \In*gem"i*nate\, v. t. [imp. & p. p. Ingeminated;
   p. pr. & vb. n. Ingeminating.] [L. ingeminatus, p. p. of
   ingeminare to double; pref. in- in + geminare. See
   Geminate.]
   To redouble or repeat; to reiterate. --Clarendon.
   [1913 Webster]

         . . . She yet ingeminates
         The last of sounds, and what she hears relates.
                                                  --Sandys.
   [1913 Webster]