Definition of phototropism
: a tropism in which light is the orienting stimulus
From the M-W Editors
Origin and Etymology of phototropism
International Scientific Vocabulary
First Known Use: 1899
Medical Dictionary
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)
Learn More about phototropism
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Britannica.com: Encyclopedia article about phototropism
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