Definition of phototropism
:a tropism in which light is the orienting stimulus
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Origin and Etymology of phototropism
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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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Britannica.com: Encyclopedia article about phototropism
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