Changeling

/ˈtʃeɪndʒlɪŋ/ noun

In folklore, a fairy child secretly substituted for a human child by supernatural beings. More broadly, any person or thing that has been exchanged or transformed, especially in mysterious circumstances.

From Middle English 'chaungeling,' combining 'change' + the suffix '-ling' (indicating something small or associated with). The folklore concept exists across European cultures, reflecting ancient anxieties about child development and unexplained behavioral changes.

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