Uppers: Also known as stimulants.  These drugs impact the nervous system and produce feelings of alertness and euphoria.  Some uppers would include cocaine, caffeine, amphetamines and even nicotine.

Uretha: The tube or canal that carries urine outside of the body from the bladder.

Uterus: The female reproductive organ (See Womb) which is pear-shaped, hollow, where the egg and sperm meet, the baby grows during pregnancy.  It is where menstrual blood comes from.(See Menstruation)  See related article Teen Girls' Development