Dictionary > Polyp

Polyp

Definition
noun, plural: polyps
(1) (zoology) The hollow, columnar, sessile form of Cnidarians (as opposed to the medusa form)
(2) (pathology) An abnormal (usually benign) pedunculated growth, protruding from a mucous membrane
Supplement
(zoology) Cnidarians take two body forms: polyp and medusa. The polyp body form is sessile, elongated, and hollow. Their lower end is attached to a substratum. Their free upper end is where the mouth and the tentacles are located. One of the major differences between polyp and medusa is their mode of reproduction. Polyps generally reproduce asexually (by budding) whereas medusae, by sexual reproduction. Some Cnidarians take a polyp body form (e.g. sea anemones and corals); others, medusa (e.g. scyphozoans). But there are also Cnidarians that exhibit both polyp and medusa stages in their life cycle (e.g. most hydrozoans).
Word origin: Greek polupous, from polus (many) + pous (foot)
Compare:

Related term(s):

  • sessile polyp
  • fleshy polyp
  • fibroepithelial polyp
  • bleeding polyp
  • duodenal polyp
  • aural polyp
  • pulp polyp


  • You will also like...

    Human Nervous System
    The Human Nervous System

    The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

    Chemical composition of the body
    Chemical Composition of the Body

    The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

    Homo Species
    The Homo Species

    The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

    Homeostatic Mechanisms and Cellular Communication
    Homeostatic Mechanisms and Cellular Communication

    Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..

    Freshwater Ecology
    Freshwater Ecology

    Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..

    Genetics and Evolution
    Genetics and Evolution

    Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

    Related Articles...

    No related articles found

    See all Related Topics