Two dictionaries on my iPad give these definitions of schizophrenia:
1912, from German Schizophrenie, coined by Swiss psychiatrist Eugen Bleuler in 1908, through New Latin, from Greek skhizo- ‘split’, from skhizein ‘to split’, from PIE base *skei- ‘to cut, split’, and phren ‘midriff; breast; soul, mind, heart; sense, understanding, reason’, from PIE base *gʷhren- ‘to think’.