Dianetics
Concise Oxford English Dictionary © 2008 Oxford University Press:
Dianetics /ˌdʌɪəˈnɛtɪks/
▶plural noun [treated as sing.] a system developed by the founder of the Church of Scientology, L. Ron Hubbard, which aims to relieve psychosomatic disorder by cleansing the mind of harmful mental images.
'Dianetics' also found in these Oxford entries:

