Definition from Wiktionary, the free dictionary
xenolog (plural xenologs)
- (genetics) A type of ortholog where the homologous sequences are found in different species because of horizontal gene transfer.
E.V. Koonin, K.S. Makarova, and L. Aravind. (2001) Horizontal Gene Transfer in Prokaryotes: Quantification and Classification. Annual Review of Microbiology 55: 709-742.