nanite is a nanomachine.
It is a term commonly used to describe an end item developed to accomplish
designed operations and whose dimensions are measured in the nanoscale. The nanite
may have programmed functions, specific purposes and a finite life span.
nanobots] -- machines with atomic sized components. [Popularized by the Star
Trek episode "Evolution"]
As to their weight, a popular question: "Do you 'feel' heavier after you
drink a mouthful of water? A mouthful of water, roughly 5 cm^3, would have
the same mass as a ~2 terabot [2 trillion nanite]
dose of 1 micron^3
You'll never feel it." Robert A. Freitas Jr.