makyō (Japanese) 1. The ‘realm of devils’ in Japanese Buddhism. In zen, this can be used to mean hallucinations that arise while in meditation.

2. With a different Chinese character for the second syllable, this means the ‘country of Māra’, as opposed to the Pure Land of the Buddha Amitābha.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)