Etymology
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pacifier (n.)

1530s, "one who pacifies or appeases," agent noun from pacify. The meaning "nipple-shaped device for babies" is recorded by 1904. Pacificator "a peacemaker" (1530s) is directly from Latin.

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Definitions of pacifier

pacifier (n.)
someone who tries to bring peace;
Synonyms: conciliator / make-peace / peacemaker / reconciler
pacifier (n.)
anything that serves to pacify;
pacifier (n.)
device used for an infant to suck or bite on;
Synonyms: comforter / baby's dummy / teething ring
From wordnet.princeton.edu