used to describe something that is considered to be frightening and dangerous because of the unnatural way in which it was created, especially because of having been genetically modified (= having had some genes changed scientifically)

Environmentalists fear that farmers have now spread this Frankencorn into most parts of the country.

They created a genetically modified organism nicknamed "Frankenfungus" that was supposed to kill chestnut blight but not the chestnut tree.