Damp"er (?), n.
That which damps or checks; as: (a) 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. (b) A contrivance, as in a pianoforte, to deaden vibrations; or, as in other pieces of mechanism, to check some action at a particular time.
Nor did Sabrina's presence seem to act as any damper at the modest little festivities.
© Webster 1913.