correspondence in structure and embryological origin but not necessarily in function: compare analogy:
between different parts of the same individual
between parts of different organisms due to evolutionary differentiation from a common ancestor
the relation existing:
between chemical compounds in a series whose successive members have a regular difference in composition
between elements in the same group of the periodic table
formal or literary a similarity often attributable to common origin
the plain law of homology, which declares that like must be compared with like — Oliver Wendell Holmes
homologic /-ʹlojik/ adj
homological /-ʹlojikl/ adj
homologically /-ʹlojikli/ adv