psycho:1

noun
psy*cho \ ˈsī-(ˌ)kō \
1919
  • psychopath

psycho:2

adjective
psycho \
1945
  • of, relating to, or being a person who is mentally or emotionally unsound or unstable especially in a way that results in dangerous or violent behavior

psych-

combining form
psych- \
  • mind : mental processes and activities
  • psychological methods
  • brain
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