De or het laudanum?

The correct Dutch article is:

het laudanum

Rule Words ending in -um and -ium: usually het. See the rule
Meaning (Dutch) opiumtinctuur, vroeger gebruikt als geneesmiddel

How to use laudanum

the laudanumhet laudanum
this laudanumdit laudanum
that laudanumdat laudanum
our laudanumons laudanum
your laudanumjouw laudanum
every laudanumelk laudanum
which laudanum?welk laudanum?
a big laudanum / the big laudanumeen groot laudanum, het grote laudanum

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