De or het defensielaboratorium?

The correct Dutch article is:

het defensielaboratorium

Rule Words ending in -um and -ium: usually het. See the rule

How to use defensielaboratorium

the defensielaboratoriumhet defensielaboratorium
this defensielaboratoriumdit defensielaboratorium
that defensielaboratoriumdat defensielaboratorium
our defensielaboratoriumons defensielaboratorium
your defensielaboratoriumjouw defensielaboratorium
every defensielaboratoriumelk defensielaboratorium
which defensielaboratorium?welk defensielaboratorium?
a big defensielaboratorium / the big defensielaboratoriumeen groot defensielaboratorium, het grote defensielaboratorium