Etymology
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ebola (n.)
virus, 1976, named for Ebola River valley in Congo, where it first was studied.
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hollow (n.)
"lowland, valley, basin," 1550s, probably a modern formation from hollow (adj.), which is from Old English holh (n.) "cave, den; internal cavity."
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thalweg (n.)
1831, from German Thalweg "path along the bottom of a valley," from thal (see dale) + weg "road, path" (see way (n.)).
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silicon (n.)
nonmetallic element, 1817, coined by British chemist Thomas Thomson from silica (silicon dioxide), from which it was isolated. The name is patterned on carbon, etc. Silicon chip first attested 1965; Silicon Valley for the Santa Clara Valley south of San Francisco, U.S., first attested 1974, from the concentration of manufacturers of silicon chips used in computers, watches, etc.
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Milan 
city in northern Italy, Roman Mediolanum, from Gaulish medios "middle" + lanu "plain," in reference to its situation in the Po Valley. Related: Milanese.
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Yosemite 
from Southern Sierra Miwok /yohhe'meti/ "they are killers." "[E]vidently a name given to the Indians of the valley by those outside it." [Bright]
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cwm (n.)

"bowl-shaped hollow at the head of a valley," 1853, from Welsh cwm "coomb" (see coomb). Mostly they are formed by glaciers.

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Shenandoah 
originally a place name in Dutchess County, N.Y., from Oneida (Iroquoian) family name Skenondoah, derived from oskenon:to "deer." Later transferred to river and valley in Virginia.
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muenster (n.)

type of semi-soft, strong-flavored cow's-milk cheese, 1902, from Münster, mountain valley in Alsace, where it is made; the place name is German, literally "minster."

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Moselle 

river in Western Europe, Latin Mosella, literally "Little Meuse," in reference to the longer River Meuse (Latin Mosa), into which it flows. From 1680s as "wine from the valley of the Moselle."

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