Pho*tot"ro*pism(?), n. [Photo- + Gr. to turn.] 1. (Plant Physiol.) The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with heliotropism.
[Webster 1913 Suppl.]
(Microbiology) exhibiting movement in a direction toward (positive phototropism) or away from (negative phototropism) a source of light.
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