phototropism

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

Definition of phototropism 

: a tropism in which light is the orienting stimulus

First Known Use of phototropism

1899, in the meaning defined above

History and Etymology for phototropism

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The first known use of phototropism was in 1899

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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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