- Animal consisting of genetically different cells derived from two (or more) different zygotes.
- Substance, such as an antibody, created from the proteins or genes of two different species.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 735 (https://doi.org/10.1515/pac-2015-1202)