What does homological mean?
Homological means relating to homology: a correspondence between biological structures that exists because those structures descend from a common ancestral form. The concept is especially important in evolutionary biology and comparative anatomy. It distinguishes shared structural origins from superficial functional similarity. For example, the forelimbs of humans, bats, whales, and dogs perform different tasks, but their basic bone pattern is homologous because it was inherited from a common mammalian ancestor. In other morphological or developmental contexts, the adjective can describe corresponding features whose resemblance reflects a shared organizational plan rather than independent convergence. The term is technical rather than everyday, and it should not be confused with “analogous,” which refers to features that resemble one another in function or appearance but do not share the same evolutionary origin.
adjectiveRelating to homology, especially to structures that correspond in their underlying organization because they share a common evolutionary origin.
- Relating to homology or to structures sharing a common evolutionary origin.
- Relating to correspondence in structure, organization, or development resulting from a common ancestral plan.
"The forelimbs of humans, bats, and whales are homological structures despite their very different functions."
"Comparative anatomists identified a homological relationship between the forelimbs of different mammals."
"The classification relies on the recognition of homological features rather than superficial resemblance."
A human arm, a bat's wing, and a whale's flipper look very different, but their shared anatomical blueprint preserves the history of a common ancestor.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of homological
The word was formed from “homology” with the suffix “-ical,” meaning “relating to.” “Homology” in turn comes through Latin from Greek homologia, derived from homologos, based on homos, meaning “same,” and -logos, referring to a relation or account. The Greek elements behind “homogeneous” and “homoeomorphic” similarly express ideas of sameness or correspondence.
Related word forms
How homological is actually used
This is a specialized term used chiefly in evolutionary biology, comparative anatomy, morphology, and related fields. It is not normally used for merely similar objects or ideas.
Easily confused with homological
Homologous structures inherit from a common ancestor, whereas analogous structures have similar functions or appearances without such a shared origin.