medieval Spanish county and later kingdom, from Vulgar Latin *castilla, from Latin castella, plural of castellum "castle, fort, citadel, stronghold" (see castle (n.)); so called in reference to the many fortified places there during the Moorish wars. The name in Spanish is said to date back to c.800. Related: Castilian. As a fine kind of soap, in English from 1610s.
a seat of government, especially a place of military authority, hence, in U.S. Southwest, "a military post," 1808, American English, from Spanish presidio "fort, settlement," from Latin praesidium "defense, protection," from praesidere "to sit before, protect" (see preside). Related: Presidial; presidary.
also Luxemburg, European state, from Germanic lutilla "little" + burg "fort, castle." Related: Luxembourgeois (1843); Luxembourger (1874). Hence also lushburg (mid-14c.), Middle English word for "a base coin made in imitation of the sterling or silver penny and imported from Luxemburg in the reign of Edward III" [OED].
in astrophysics, 1968, probably with awareness of the notorious Black Hole of Calcutta, incident of June 19, 1756, in which 146 British POWs taken by the Nawab of Bengal after the capture of Fort William were held overnight in a punishment cell of the barracks (meant to hold 4 people) and all but 23 perished.
city in Michigan, U.S., from French détroit, literally "straits," from Old French destreit (12c.), from Latin districtum, neuter of districtus (see district (n.)). A French fort was built there 1701. By 1918 the city name was synonymous with "U.S. automobile manufacturing."
legendary castle of King Arthur, a name first found in medieval French romances; the name corresponds to Latin Camuladonum, the Roman forerunner of Colchester, which was an impressive ruin in the Middle Ages. But Malory identifies it with Winchester and Elizabethans tended to see it as Cadbury Castle, an Iron Age hill fort near Glastonbury.
"ancient Greek city-state," 1894, from Greek polis, ptolis "citadel, fort, city, one's city; the state, community, citizens," from PIE *tpolh- "citadel; enclosed space, often on high ground; hilltop" (source also of Sanskrit pur, puram, genitive purah "city, citadel," Lithuanian pilis "fortress").
German city, the -burg is German Burg "fort," in reference to the moated castle built there c. 825; the first element is perhaps Old High German hamma "ham, back of the knee" in a transferred sense of "bend, angle," with reference to its position on a river bend promontory; or Middle High German hamme "enclosed area of pastureland."
"a hill of moderate elevation and more or less rounded outline," Old English dun "height, hill, moor," from Proto-Germanic *dunaz- (source also of Middle Dutch dunen "sandy hill," Dutch duin), "probably a pre-insular loan-word from Celtic" [Cambridge Dictionary of English Place-Names], in other words, borrowed at a very early period, before the Anglo-Saxon migration, perhaps from PIE root *dheue- "to close, finish, come full circle."
The more general meaning "elevated rolling grassland; high, rolling region not covered by forest" is from c. 1400. Specifically of certain natural pastureland districts of south and southeast England (the Downs) by mid-15c.
The non-English Germanic words tend to mean "dune, sand bank" (see dune), while the Celtic cognates tend to mean "hill, citadel" (compare Old Irish dun "hill, hill fort;" Welsh din "fortress, hill fort;" and second element in place names London, Verdun, etc.). German Düne, French dune, Italian, Spanish duna are said to be loan-words from Dutch.
