Noun
any of various animals that have been tamed and made fit for a human environment
Source: WordNetMeasles and TB evolved from diseases of our cattle, influenza from a disease of pigs, and smallpox possibly from a disease of camels. The Americas had very few native domesticated animal species from which humans could acquire such diseases. Jared Diamond
Eurasia ended up with the most domesticated animal species in part because it's the world's largest land mass and offered the most wild species to begin with. Jared Diamond