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pho·to·dy·nam·ic -dī-'nam-ik adj of, relating to, or having the property of intensifying or inducing a toxic reaction to light (as the destruction of cancer cells stained with a light-sensitive dye) in a living system <\photodynamic action> <\photodynamic therapy>
pho·to·dy·nam·i·cal·ly -i-k(ə-)lē adv
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pho·to·dy·nam·ic (fo″to-di-namґik) [photo- + dynamic] powerful in the light; used particularly for the action exerted by fluorescent substances in the light.Medical dictionary. 2011.