IPA: /ˈdæmpənər/
KK: /ˈdæmpənər/
A device used to make something slightly wet or to reduce the intensity of something.
The dampener helped to reduce the noise from the machinery.
Dampener → It is formed from "dampen" (from Middle English *dampnen*, meaning to make damp or wet) and the suffix "-er" (meaning a person or thing that performs an action). A dampener is something that makes something damp or wet, or it can refer to a person or thing that reduces enthusiasm or intensity.
Think of something that 'makes damp' ('dampen') and the '-er' indicates it is a thing that performs that action. A dampener is something that makes things damp or less intense.