chimera

1. Any fantastic creature combining parts from different animals.
2. A foolish, incongruous, or vain thought or product of the imagination. (figuratively)
3. Anything composed of very disparate parts. (figuratively)
4. A grotesque like a gargoyle, but without a spout for rainwater.
5. An organism with genetically distinct cells originating from two or more zygotes. · The DNA test returned a false negative because the killer was a chimera, having absorbed her twin in utero.
6. Synonym of bogeyman: any terrifying thing, especially as an unreal, imagined threat. (figuratively)

الجمع chimeras