Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Corresponding or similar in position, value, structure, or function.
  • adjective Derived from the same species.
  • adjective Biology Similar in structure and evolutionary origin, though not necessarily in function, as the flippers of a seal and the hands of a human.
  • adjective Immunology Relating to the correspondence between an antigen and the antibody produced in response to it.
  • adjective Relating to chromosomes that have the same morphology and linear sequence of gene loci.
  • adjective Relating to genes that are derived from a common ancestor.
  • adjective Chemistry Belonging to or being a series of organic compounds, each successive member of which differs from the preceding member by a constant increment, especially by an added CH2 group.

from The Century Dictionary.

  • Having the same relative position, proportion, value, or structure; having correspondence or likeness.
  • In pathology, noting a neoplasm composed of tissues of the same type as those of the part from which it springs: distinguished from heterologous.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Geom.) Corresponding in relative position and proportion.
  • adjective (Alg.) Having the same relative proportion or value, as the two antecedents or the two consequents of a proportion.
  • adjective (Chem.) Characterized by homology; belonging to the same type or series; corresponding in composition and properties. See Homology, 3.
  • adjective (Biol.) Being of the same typical structure; having like relations to a fundamental type to structure; as, those bones in the hand of man and the fore foot of a horse are homologous that correspond in their structural relations, that is, in their relations to the type structure of the fore limb in vertebrates.
  • adjective (Physiol.) See under Stimulus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Showing a degree of correspondence or similarity.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species
  • adjective having the same evolutionary origin but not necessarily the same function

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From Greek homologos, agreeing : homo-, homo- + logos, word, proportion; see leg- in Indo-European roots.]

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