dement

dement

[dih-ment]
verb (used with object) Obsolete.
to make mad or insane.

Origin:
1535–45; < Late Latin dēmentāre to deprive of mind, equivalent to Latin dēment- (stem of dēmēns) out of one's mind (dē- de- + ment- (stem of mēns) mind) + -āre infinitive suffix

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World English Dictionary
dement (dɪˈmɛnt)
 
vb
1.  (intr) to deteriorate mentally, esp because of old age
2.  rare (tr) to drive mad; make insane
 
[C16: from Late Latin dēmentāre to drive mad, from Latin de- + mēns mind]

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Word Origin & History

dement
1540s, "to drive mad," probably from M.Fr. dementer, from L.L. dementare "out of one's mind," from phrase de mente, from de + mente, ablative of mens mind" (see mind (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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