Ur

Uraninite
Naturally occuring Uranium Oxide.
Uranium
Although uranium is the longest known member of the actinide group of metals, it attracted scant attention until the discovery of uranium fission in 1939.
Uranium IV Fluoride

UF4

Green crystalline solid compound of uranium with an insignificant vapour pressure and very slight solubility in water.

Uranium Oxide

UO2

Greyish-black brittle and heavy mineral.

Uranus
The seventh planet from the sun in our solar system.
Urea
Common name for Carboxamide.
Urea Cycle
A metabolic pathway in vertebrates, for the synthesis of urea from amino groups and carbon dioxide.
Urea Formaldehyde
A non-transparent thermosetting resin or plastic, made from urea and formaldehyde heated in the presence of a mild base such as ammonia or pyridine.

Urea Methanal
Another name for Urea Formaldehyde.
Ureotelic
Organisms which excrete excess nitrogen in the form of urea.
Uricotelic
Organisms which excrete excess nitrogen in the form of uric acid.
Urine
Liquid waste that leaves the body, compostition 96% water, 2% urea, 2% salts.
URL
Abbreviation of Universal Resource Locator.