A person who coddles or pampers someone excessively; also a small cooking pot with a lid used for gently heating eggs in water.
From 'coddle' (to treat with excessive care) plus '-er' (one who does the action), or the cooking device named for its coddling function; 'coddle' possibly derives from an Old English root meaning 'to cook gently.'
A coddler is one of the few kitchen tools with a personality—it's specifically designed to be overprotective, keeping eggs at exactly the right gentle heat, which is why Victorians loved them for their metaphorical match to emotional coddling.
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