damper

Short definition from Wiktionary

Noun

1. 1
   Something that damps or checks: A valve or movable plate in the flue or other part of a stove, furnace, etc., used to check or regulate the draught of air.
2. 2
   Something that damps or checks: A contrivance (sordine), as in a pianoforte, to deaden vibrations; or, as in other pieces of mechanism, to check some action at a particular time.
3. 3
   Something that damps or checks: Something that kills the mood.
4. 4
   Something that damps or checks: A device that decreases the oscillations of a system.
5. 5
   Something that damps or checks: A shock absorber.
6. 6
   Bread made from a basic recipe of flour, water, milk, and salt, but without yeast.
7. 7
   A shop till.

Adjective

1. 1
   comparative form of damp: more damp