Dictionary

homologous

-adjective

1. Showing a degree of correspondence or similarity such that it suggests a common origin.
2. (biology) corresponding to a similar structure in another life form with a common evolutionary origin e.g. flippers and hands
3. (chemistry) belonging to a series of aliphatic organic compounds that differ only by the addition of a CH₂ group
4. (genetics) having the same morphology as another chromosome
5. homologous blood donation
6. That which is or are derived from the same ancestral structure, base or origination.