Relating to Robert Brown, the Scottish botanist, or to his methods of plant classification and botanical science.
From the proper name Robert Brown plus the adjectival suffix '-ian', meaning 'of or relating to.' It entered English in the 19th century as botanical and scientific communities acknowledged his contributions.
Robert Brown was the first to see the jiggling motion of pollen grains in water (Brownian motion, named after him)—a discovery he thought was life itself, but it was actually the foundation of atomic theory three centuries before atoms were proven.
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