\De*ment"\, v. t. [L. dementare, fr. demens, -mentis, out
of one's mind, mad; de + mens mind. See {Mental}, and cf.
{Dementate}.]
To deprive of reason; to make mad. [R.] --Bale.

\De*ment"\, a. [L. demens, - mentis.]
Demented; dementate. [R.] --J. H. Newman.