damper

Pronunciation: /ˈdæmpɚ/

The English word “damper” has 7 meanings listed here.

noun

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.
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.
Something that kills the mood.
A device that decreases the oscillations of a system.
A shock absorber.
Bread made from a basic recipe of flour, water, milk, and salt, but without yeast.
A shop till.

From damp (verb) + -er. The name of the type of bread is first attested in 1825, and originally likely refers to damping the appetite.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.