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