I am not sure there is an exact definition of dust...
Sending less than 0.01 BTC to any recipient — The network considers these small outputs to be “dust,” and discourages them by requiring a fee. If it was not discouraged, someone could take 1.0 BTC, and create 1,000,000 transactions of 0.000001 BTC each, for free, which would clog the network. So, that's one definition of dust.
Dust is a lot smaller than 0.01 bitcoin’s. 0.01 bitcoin is now $70