单词	phototropism
释义	phototropism noun pho·​tot·​ro·​pism fō-ˈtä-trə-ˌpi-zəm  : a tropism in which light is the orienting stimulus Example Sentences Recent Examples on the Web If the tree has grown at a slant all its life, it’s probably because of phototropism, Brosius says. Samantha Chery, Washington Post, 2 Aug. 2022 The leaning effect could be a result of phototropism, where plants naturally position themselves toward sunlight. Samantha Chery, Washington Post, 2 Aug. 2022 The fungus grows toward the hottest and most radioactive places, like phototropism but for deadly toxins. Caroline Delbert, Popular Mechanics, 6 Feb. 2020 The new polymer, described in a paper in the journal Nature Nanotechnology, is capable of phototropism, or the ability to follow the sun in its daily journey across the sky. Jason Daley, Smithsonian, 7 Nov. 2019 Word History Etymology International Scientific Vocabulary First Known Use 1899, in the meaning defined above Medical Definition phototropism noun pho·​tot·​ro·​pism fō-ˈtä-trə-ˌpiz-əm  ˌfōt-ō-ˈtrō-ˌpiz-əm  1 : a tropism in which light is the orienting stimulus see heliotropism 2 : the reversible change in color of a substance produced by the formation of an isomeric modification when exposed to radiant energy (as light)
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