phototropism

noun pho·tot·ro·pism \ fō-ˈtä-trə-ˌpi-zəm \

Definition of phototropism

: a tropism in which light is the orienting stimulus

Origin and Etymology of phototropism

International Scientific Vocabulary


Medical Dictionary

phototropism

noun pho·tot·ro·pism \ fō-ˈtä-trə-ˌpiz-əm , ˌfōt-ō-ˈtrō-ˌpiz-əm \

medical Definition of phototropism

: 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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