De or het pathopsychologie?

The correct Dutch article is:

de pathopsychologie

Rule Words ending in -logie: always de. See the rule
Meaning (Dutch) (medisch, psychologie) psychologie van de belevingen van de zieke mens

How to use pathopsychologie

the pathopsychologiede pathopsychologie
this pathopsychologiedeze pathopsychologie
that pathopsychologiedie pathopsychologie
our pathopsychologieonze pathopsychologie
your pathopsychologiejouw pathopsychologie
every pathopsychologieelke pathopsychologie
which pathopsychologie?welke pathopsychologie?
a big pathopsychologie / the big pathopsychologieeen grote pathopsychologie, de grote pathopsychologie

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).