De or het psychologisme?

The correct Dutch article is:

het psychologisme

Rule Words ending in -isme: almost always het. See the rule
Meaning (Dutch) (psychologie, filosofie) filosofisch opvatting die de psychologie als de fundamentele wetenschap beschouwt

How to use psychologisme

the psychologismehet psychologisme
this psychologismedit psychologisme
that psychologismedat psychologisme
our psychologismeons psychologisme
your psychologismejouw psychologisme
every psychologismeelk psychologisme
which psychologisme?welk psychologisme?
a big psychologisme / the big psychologismeeen groot psychologisme, het grote psychologisme

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