damper

n.

1.

That which damps or checks; Nor did Sabrina's presence seem to act as any damper at the modest little festivities. - W. Black.

Noun	1.	damper - a movable iron plate that regulates the draft in a stove or chimney or furnace
	2.	damper - a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations Synonyms: muffler
	3.	damper - a depressing restraint; "rain put a damper on our picnic plans"

acoustic tile, andiron, antiknock, arrest, baffler, bearing rein, bit, brake, chain, check, checkrein, chill, chock, clog, coal tongs, cold water, countercheck, crane, crepehanger, crook, curb, curb bit, cushion, damp, dampener, determent, deterrent, discouragement, doorstop, drag, drag sail, drift anchor, drift sail, drogue, fetter, fire hook, fire tongs, firedog, gag, grate, grating, grid, griddle, gridiron, grill, griller, holdback, hushcloth, killjoy, lifter, martingale, muffle, muffler, mute, muzzle, pelham, pessimist, poker, pothook, quietener, remora, salamander, scotch, sea anchor, shackle, silence cloth, silencer, snaffle, soft pedal, sordine, sordino, sound-absorbing material, soundproofing, soundproofing insulation, sourdine, spit, spoilsport, spoke, stay, stop, tongs, trammel, tripod, trivet, turnspit, wet blanket