Definition of "alienism" in English

noun

1. The fact or position of being an alien; alienage.

2. A foreignism, a word (or trait, etc) from another language (or country, etc).

noun

1. (archaic) The study or treatment of mental disorders; psychiatry.

   • 2016 Dr. Seward, Penny Dreadful s3e1, 32min Since I'm sure you're not familiar with alienism I'll tell you how it works.