Nanotechnology ("nanotech") is the manipulation of matter on an atomic, molecular, and supramolecular scale.
Sources:

http://www.ibn.a-star.edu.sg/images/.../press_103.pdf

http://www.nature.com/nnano/journal/....2014.208.html

http://www.gizmag.com/green-tea-nano...elivery/34226/