Browse the Concise Encyclopedia
- upanishad
- upasaka
- ur
- uracil
- ural mountains
- uralic languages
- uraninite
- uranium
- uranium-234-uranium–238 dating
- uranium-thorium-lead dating
- uranus
- urartu
- urban climate
- urban planning
- urbino majolica
- urdu language
- urea
- uremia
- uric acid
- urinalysis
- urinary system
- urination
- urine
- url
- urmia, lake
- urnfield culture
- urogenital malformation
- urology
- ursula, saint
- usa today
- usb
- usury
- ute
- uterine bleeding
- uterine cancer
- uterus
- utica
- utilitarianism
- uto-aztecan languages
- utrecht school
- utrecht, peace of
- uttar pradesh
- uttarakhand
- uveitis
- uxmal
- uzi submachine gun