D defs.my
Entry 1 sense Webster, 1913

Brownian

· Brown·i·an · IPA /ˈbɹaʊni.ən/
01 a. Pertaining to Dr. Robert Brown, who first demonstrated (about 1827) the commonness of the motion described below.
  1. 1.
    Pertaining to Dr. Robert Brown, who first demonstrated (about 1827) the commonness of the motion described below.
Phrases & compounds
Brownian motion — the peculiar, rapid, vibratory movement exhibited by the microscopic particles of substances when suspended in water or other fluids.