- An organism, organ, or part consisting of two or more tissues of different genetic composition, produced as a result of organ transplant, grafting, or genetic engineering.
- A substance, such as an antibody, created from the proteins or genes or two different species.
- An individual who has received a transplant of genetically and immunologically different tissue.
- A fanciful mental illusion or fabrication.
[Middle English chimere, Chimera, from Old French, from Latin chimaera, from Greek khimaira, chimera, she-goat.]



