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

  • n. The turning or bending movement of an organism or a part toward or away from an external stimulus, such as light, heat, or gravity.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the turning of an organism in response to a stimulus, either towards or away from the stimulus
  • n. viral tropism, or which type of tissue supports a certain virus

from the GNU version of the Collaborative International Dictionary of English

  • n. Modification of the direction of growth, caused by some external influence, such as light; -- sometimes used for motion of an organism toward or away from an external stimulus, more properly called taxis.

from The Century Dictionary and Cyclopedia

  • n. In biology, growth, bending, orientation, or locomotion of organisms, or of parts of organisms, in relation to external agents.
  • n. In a stricter use, the growing or bending of organisms, or of parts of organisms, in relation to external agents.

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

  • n. an involuntary orienting response; positive or negative reaction to a stimulus source


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

From -tropism.


  • I don’t see how tropism is connected to suffering. allqsallthetime Says:

    “But it’s not like I, ya know, eat them.”

  • Such a turning in response to a stimulus is called a tropism (troh'pizm; "turning" G).

    The Human Brain

  • A profound study of the motions of the Infusoria and a very penetrating criticism of the idea of tropism have been made recently by

    Evolution créatrice. English

  • Aboody and her colleagues were the first to demonstrate in 2000 the inherent propensity of neural stem cells to home in on invasive tumor cells, also known as tropism, even migrating from the opposite side of the brain or across the blood-brain barrier. - latest science and technology news stories

  • This 'tropism' has been classically exhibited in the events surrounding the recent and intensely upsetting Flotilla incidents.

    Qanta Ahmed, MD: Israel and the Flotilla: On the Dangers of a Binary View

  • It would, therefore, be a misconception to speak of tropism as of reflexes, since tropisms are reactions of the organism as a whole, while reflexes are reactions of isolated segments.

    Manhood of Humanity.

  • It is impossible to understand in this case, firstly, how a mutation could cause the eyes to be divided and doubly adapted to two different optic conditions, and, secondly, how at the same time a convenient 'tropism' should occur which caused the animal to swim with its eyes half in and half out of water.

    Hormones and Heredity

  • The use of CCR5, CXCR4 or both co-receptors defines the "tropism" of the virus strain.

    BNET Articles

  • Re: HALO DER, DISJOINTED WALL OF TEXT AHOY - tropism - May. 8th, 2010 06: 50 pm (UTC) Expand

    Someone Is Angry On the Internet

  • Meanwhile, my co-workers showed the tropism of the virus for CD4T cells and identified the CD4 surface molecule as the main receptor to the virus.

    Luc Montagnier - Autobiography


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  • hacker tropisms for science fiction, music.

    February 11, 2011