One who embraces or holds someone in an embrace; also, a person who commits the legal offense of embracery.
From embrace + -er (from Old English -ere and Latin -arius, agent nouns). The -er suffix is the most common way English creates 'people who do X' nouns.
Simple words like 'embracer' show English's genius for productivity—add -er to almost any verb and you get 'someone who does that thing.' That's why you can invent 'googler' or 'zoomer' and everyone understands immediately.
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