The turning or bending movement of an organism or a part toward or away from an external stimulus, such as light, heat, or gravity. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "tropism" in a sentence
"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"