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phototropism

(fō tä′trə piz′əm)

noun

any positive, or negative, movement of a part of a plant toward, or away from, light sources

see heliotropism

Origin: photo- + tropism

Related Forms:

phototropic adjective

See phototropism in American Heritage Dictionary 4

noun

Growth or movement of a sessile organism toward or away from a source of light.

Related Forms:

phoˌto·troˈpic (fōˌtə-trōˈpĭk, -trŏpˈĭk) adjective

phoˌto·troˈpi·cal·ly adverb

Learn more about phototropism

phototropism medical definition

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