De or het proprium?

The correct Dutch article is:

het proprium

Rule Words ending in -um and -ium: usually het. See the rule
Meaning (Dutch) (religie, muziek) de reeks wisselende gezangen van de mis

How to use proprium

the propriumhet proprium
this propriumdit proprium
that propriumdat proprium
our propriumons proprium
your propriumjouw proprium
every propriumelk proprium
which proprium?welk proprium?
a big proprium / the big propriumeen groot proprium, het grote proprium

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