American Heritage® Dictionary of the English Language, Fourth 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.
Century Dictionary and Cyclopedia
- n. In biology, growth, bending, orientation, or locomotion of organisms, or of parts of organisms, in relation to external agents. Positive tropism is growth or motion toward and negative tropism away from the external agent. Tropisms are physiological reactions called forth by an agent working locally and resulting in a definite orientation. In this wide sense tropism includes taxis, and the various terms designating forms of tropism (see extract under def. 2) are often used where strict usage would require the corresponding term ending in -taxis.
- n. In a stricter use, the growing or bending of organisms, or of parts of organisms, in relation to external agents. Tropisms are reactions to agents that act from one side and produce modifications of direction of growth. Different forms of tropism are designated, not by the differences in the organs that are stimulated, whether sense-organs or simple protoplasm, but by the nature of the exciting agent. See the extract.
- n. biology the turning of an organism in response to a stimulus, either towards or away from the stimulus
- n. virology viral tropism, or which type of tissue supports a certain virus
GNU Webster's 1913
- n. (Physiol.) 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
- n. an involuntary orienting response; positive or negative reaction to a stimulus source
- From -tropism. (American Heritage® Dictionary of the English Language, Fourth Edition)
“I don’t see how tropism is connected to suffering. allqsallthetime Says:”
“Such a turning in response to a stimulus is called a tropism (troh'pizm; "turning" G).”
“A profound study of the motions of the Infusoria and a very penetrating criticism of the idea of tropism have been made recently by”
“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.”
“This 'tropism' has been classically exhibited in the events surrounding the recent and intensely upsetting Flotilla incidents.”
“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.”
“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.”
“The use of CCR5, CXCR4 or both co-receptors defines the "tropism" of the virus strain.”
“Re: HALO DER, DISJOINTED WALL OF TEXT AHOY - tropism - May. 8th, 2010 06: 50 pm (UTC) Expand”
“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.”
These user-created lists contain the word ‘tropism’.
A list of words that are odd or words that I have looked up.
Collected from reading
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turning toward; affecting; maintaining or regulating
Looking for tweets for tropism.