the GNU version of the Collaborative International Dictionary of English
adj. Pertaining to Dr. Robert Brown, who first demonstrated (about 1827) the commonness of the motion described below.
The Century Dictionary and Cyclopedia
n. Pertaining or relating to any person bearing the name of Brown; Brunonian.
Word Usage
"This is just like the classic physics observation by Robert Brown of the random walk traveled by pollen particles floating on water, demonstrating random thermal or "brownian" motion."