Definition of McNaghten rules in English:

McNaghten rules

(also McNaughten rules, M'Naghten)

proper noun

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).

Pronunciation:

McNaghten rules

/məkˈnɔːt(ə)n/