Source : Webster's Revised Unabridged Dictionary (1913)

Dementate \De*men"tate\, a. [L. dementatus, p. p. See {Dement},
   v. t.]
   Deprived of reason.

         Arise, thou dementate sinner!            --Hammond.

Dementate \De*men"tate\v. t.
   To deprive of reason; to dement. [R.] --Burton.