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photosynthesis
photosynthesize
photosystem
phototaxis
phototherapy
phototoxic
phototransistor
phototropic
phototropism
phototropy
phototube
phototypeset
phototypesetting
photovoltaic
photovoltaic cell
photovoltaic effect
phragmites
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phototropism

pho·tot·ro·pism [ fō tóttrə pìzzəm ]


noun 
Definition:
 
growth toward light: the tendency of an organism to grow toward or away from a source of light

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