Old English brun "dark, dusky," developing a definite color sense only 13c., from Proto-Germanic *brunaz (source also of Old Norse brunn, Danish brun, Old Frisian and Old High German brun, Dutch bruin, German braun), from PIE root *bher- (2) "bright; brown."
The Old English word also had a sense of "brightness, shining," preserved only in burnish. The Germanic word was adopted into Romanic (Middle Latin brunus, Italian and Spanish bruno, French brun). Brown sugar is from 1704. Brown Bess, slang name for old British Army flintlock musket, is first recorded 1785. Brown study "state of mental abstraction or meditation" is from 1530s; OED says the notion is "gloomy." Brown-paper "kind of coarse, stout, unbleached paper used for wrapping" is from 1650s.
"town and former imperial province of northern Germany, an Anglicization of GermanBraunschweig, literally "Bruno's settlement," from Bruno + Old Saxon wik "village," which is from Latin (see wick (n.2)). Traditionally founded c. 861 and named for Bruno son of Duke Ludolf of Saxony.
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Definitions of Bruno from WordNet
German pope from 1049 to 1054 whose papacy was the beginning of papal reforms in the 11th century (1002-1054);
Synonyms: Leo IX / Bruno of Toul
(Roman Catholic Church) a French cleric (born in Germany) who founded the Carthusian order in 1084 (1032-1101);
Synonyms: Saint Bruno / St. Bruno
Italian philosopher who used Copernican principles to develop a pantheistic monistic philosophy; condemned for heresy by the Inquisition and burned at the stake (1548-1600);