\fō-ˈtä-trə-ˌpiz-əm, ˌfōt-ō-ˈtrō-ˌpiz-əm\

Definition of PHOTOTROPISM

: a tropism in which light is the orienting stimulus—see heliotropism
: 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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