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Upper Avon
- a river in central England that flows through Stratford-on-Avon and empties into the Severn
Upper Avon River
- a river in central England that flows through Stratford-on-Avon and empties into the Severn
Ursa Major
- a constellation outside the zodiac that rotates around the North Star
Uplands
- elevated (e.g., mountainous) land
- hill country
Urinary Calculus
- a calculus formed in the kidney
- a calculus formed in the kidney
Ursa Minor
- a constellation outside the zodiac that rotates around the North Star
Ulugh Muztagh
- a mountain in the Kunlun range in China (25,340 feet high)
Ulugh Muz Tagh
- a mountain in the Kunlun range in China (25,340 feet high)
Uncompahgre Peak
- the highest peak in the San Juan Mountains of southwestern Colorado (14,309 feet high)
Unit Cell
- the smallest group of atoms or molecules whose repetition at regular intervals in three dimensions produces the lattices of a crystal
- the smallest group of atoms or molecules whose repetition at regular intervals in three dimensions produces the lattices of a crystal