[1] : Jargon File (4.3.1, 29 Jun 2001)

gray goo n. a hypothetical substance composed of sagans of
   sub-micron-sized self-replicating robots programmed to make copies of
   themselves out of whatever is available. the image that goes with the
   term is one of the entire biosphere of earth being eventually converted
   to robot goo. this is the simplest of the nanotechnology disaster
   scenarios, easily refuted by arguments from energy requirements and
   elemental abundances. compare blue goo.


see also:
sagan nanotechnology blue goo 

Goo >> G Words
Goo, definition of term: Goo
goo_pag1.html

Consumption Goo >> C Words
Consumption Goo, definition of term: Consumption Goo
consumption+goo_pag1.html

Blue Goo >> B Words
Blue Goo, definition of term: Blue Goo
blue+goo_pag1.html