| | - Ulyanovsk
- oblast (province), western Russia. The oblast lies athwart the middle Volga River, which is there transformed into a broad lake by the downstream Samara dam. The larger western part lies ...
- Uman
- city, Cherkasy oblast (province), central Ukraine, on the Umanka River. It dates from the Middle Ages and was incorporated in 1795. Uman is an industrial centre specializing in scientific instruments, ...
- umangite
- a copper selenide (Cu3Se2) occurring only in small grains or fine granular aggregates with other copper minerals of the sulfide group. The mineral is bluish black with a reddish tint. ...
- Umar I
- the second Muslim caliph (from 634), under whom Arab armies conquered Mesopotamia and Syria and began the conquest of Iran and Egypt.
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