De or het supplement?

The correct Dutch article is:

het supplement

  • English: supplement
  • Plural: de supplementen
  • Diminutive: het supplementje
Rule Words ending in -ment: usually het. See the rule
Meaning (Dutch) 1. iets dat als aanvulling toegevoegd wordt 2. (wiskunde) die hoek die samen met de gegeven hoek 180 graden volmaakt

How to use supplement

the supplementhet supplement
this supplementdit supplement
that supplementdat supplement
our supplementons supplement
your supplementjouw supplement
every supplementelk supplement
which supplement?welk supplement?
a big supplement / the big supplementeen groot supplement, het grote supplement
the supplement (plural)de supplementen, deze supplementen

Dutch words ending in supplement

ereloonsupplement | kamersupplement | voedingssupplement | diplomasupplement

In compound words, the last part decides the article. See the rule

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