Dictionary > Domain

Domain

Definition
noun, plural: domains
(1) (taxonomy) The highest taxonomic rank of organisms in which there are three groupings: Archaea, Bacteria and Eukarya.
(2) (zoogeography) A major faunal area of the earth’s surface.
(3) (anatomy) A place in or a division of the body or a part of the body, as abdominal region.
(4) (molecular biology) A part of a molecule or structure with common physico-chemical features or properties, as in polar domain, atp-binding domain, helical domain, etc.
(5) (general) A realm of knowledge, thought, responsibility, etc., as the domain of science.
Supplement
In biological taxonomy, a domain is the highest order of life classification, even higher than a Kingdom. Carl Woese introduced a three-domain system of classification in 1990 where organisms are divided into three domains: Archaea, Bacteria and Eukarya. Both the Domain Bacteria and Domain Archaea include prokaryotic organisms whereas the Domain Eukarya includes all eukaryotic organisms.
Word origin: French domaine, blend of Old French demaine (from Late Latin dominicum) and Latin dominium, property, both from dominus, lord
Synonym:

  • superkingdom

Related terms:

  • apple domain
  • dinucleotide domain
  • egf like domain
  • exit domain
  • paired box domain
  • protein domain


  • You will also like...

    Nephrolepis exaltata
    Vascular Plants: Ferns and Relatives

    Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

    3D rendering of an antibody
    Passive and Active Types of Immunity

    Lymphocytes are a type of white blood cell capable of producing a specific immune response to unique antigens. In thi..

    Population Regulation in an Ecosystem
    Population Regulation in an Ecosystem

    With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

    Still Water Community Plants
    Still Water Community Plants

    This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..

    Neural Control Mechanisms
    Neural Control Mechanisms

    Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

    dinosaurs
    The Dinosaurs

    Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..