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“A material having a physicochemical structure on a scale greater than typically atomic/ molecular dimensions but less than 100 nm (nanostructure), which exhibits physical, chemical and/or biological characteristics associated with its nanostructure.”1

“Material with one or more external dimensions, or an internal structure of 100 nm or less, which could exhibit novel characteristics compared to the same material without nanoscale features.”2

1. G. Oberdörster, A. Maynard, K. Donaldson, et al. “Principles for characterizing the potential human health effects from exposure to nanomaterials: elements of a screening strategy,” Particle and Fibre Toxicology 2005, 2:8.

2. T. Schneider, et al., “Evaluation and control of occupational health risks from nanoparticles,” TemaNord 2007-581, at 14 (2007).