1. something that corresponds to or is similar in structure, function, or origin to something else
Usage: biology; chemistry
2. a gene or chromosome that corresponds to another gene or chromosome
Usage: genetics

Examples

• The wing of a bat is a homolog of the human arm.
• Scientists identified the homolog of this gene in mice.
• Each chromosome has a homolog from the other parent.
• The protein homolog functions similarly across species.
• Researchers compared the human gene with its homolog in fruit flies.
• The structural homolog shows the same folding pattern.