D defs.my
Entry 1 sense Webster, 1913

Dementia

/dĭm-ĕn'-shē-ə/ · De·men·ti·a · IPA /dɪˈmɛnʃə/
01 n. Insanity; madness; esp. that form which consists in weakness or total loss of thought and reason; mental imbecility; idiocy.
  1. 1.
    Insanity; madness; esp. that form which consists in weakness or total loss of thought and reason; mental imbecility; idiocy.