Definition of McNaghten rules in English:

McNaghten rules

Line breaks: McNagh¦ten rules
Pronunciation: /məkˈnɔːt(ə)n
 
/
(also M'Naghten or McNaughten rules) British
Rules or criteria for judging criminal responsibility where there is a question of insanity.

Origin

established by the House of Lords, following the case of Regina v McNaghten (1843).