der Wirkstoff
Translation
active ingredient, active substance, drug substance
Examples
Dieses Medikament enthält einen neuen Wirkstoff.
This medicine contains a new active ingredient.
Die Forscher testen die Wirkung des Wirkstoffs.
The researchers are testing the effect of the active substance.
Grammar Patterns
der Wirkstoff active ingredient This medicine contains a new active ingredient.
Similar Words
Inhaltsstoff (ingredient), Substanz (substance)
Etymology
From 'wirken' (to work, to have an effect) and 'Stoff' (substance). Literally 'working substance'.
Memory Tips
Think of it as the 'working stuff' in a medicine that produces the effect.