A person who or thing which quiets or soothes; a sedative; a silencer.

figurative. Something which cools emotion, excitement, or ardour, or which dampens the spirits. Now rare.

The action or result of allaying something (in various senses of allay, v.1); esp. subduing, assuaging, moderation. Also: an instance of this.

Lessening of the force or intensity of something; abatement; moderation; alleviation; an instance of this. Also: a calming or moderating influence.

transferred and figurative. Something to cool or assuage the heat of passion, etc.

A person or thing that adjusts, settles, tranquillizes, etc.

One who or that which calms.

Something which lulls; spec. a lulling sound, etc.

One who or that which tranquillizes; spec. any of a large class of drugs in widespread use since the 1950s for the reduction of tension or…

= calmative, n.

Something which steadies.

A medical agent which quiets inordinate action of an organ; transferred and figurative anything which has a calming effect.

A thing which quiets or soothes.

A soothing influence.