Definitions:

1. A rubber, plastic, or silicone object designed for infants to suck on for comfort andto satisfy their natural sucking reflex. NOUN
   • The baby stopped crying after she was given her havorite pacifier.
2. A small device, usually of rubber or plastic containing a protruding nipple-shaped portion which a baby may place in its mouth and suck on. NOUN
   • The pacifier contained a small amount of water to prevent it from becoming too hard or uncomfortable.
3. Refers to a person or object that helps calm or pacify others. NOUN
   • As the mediator, she acted as a pacifier in the heated debate, helping both sides reach an agreement.

Synonyms:

• appeaser
• baby's dummy
• comforter
• conciliator
• dummy
• mediator
• peacemaker
• reconciler
• soother