a. 苏格兰的植物学家Robert Brown 的

Brownian \Brown"i*an\, a.
Pertaining to Dr. Robert Brown, who first demonstrated (about
1827) the commonness of the motion described below.

{Brownian motion}, {Brownian movement}, the peculiar, rapid,
vibratory movement exhibited by the microscopic particles
of substances when suspended in water or other fluids.