Definition of dementalize in English:
dementalize
(also dementalise)
verb ˌdiːˈmɛntəlʌɪzˌdiːˈmɛnt(ə)lʌɪz
with object To deprive of the capacity for thought; to brutalize or dehumanize; to remove mind or a mental quality from.
Origin
Mid 19th century. From de- + mental + -ize.