Chimaera meaning : A cartilaginous marine fish in the subclass Holocephali and especially the order Chimaeriformes, with a blunt snout, long tail, and a spine before the first dorsal fin Alternative letter-case form of Chimera (a flame-spewing monster often represented as having two heads, one of a goat and the other of a lion; the body of a goat; and a serpent as a tail). Any fantastic creature with parts from different animals. Anything composed of very disparate parts. A foolish, incongruous, or vain thought or product of the imagination. A grotesque like a gargoyle, but without a spout for rainwater. An organism with genetically distinct cells originating from two or more zygotes. Usually chimaera: a cartilaginous marine fish in the subclass Holocephali and especially the order Chimaeriformes, with a blunt snout, long tail, and a spine before the first dorsal fin.