phototropism

noun
pho·​tot·​ro·​pism | \ fō-ˈtä-trə-ˌpi-zəm How to pronounce phototropism (audio) \

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 How to pronounce phototropism (audio) , ˌfōt-ō-ˈtrō-ˌpiz-əm How to pronounce phototropism (audio) \

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)

More from Merriam-Webster on phototropism

Britannica.com: Encyclopedia article about phototropism

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