teratoma. [terâ²ÉtÅâ²mÉ] pl. teratomas, teratomata. a tumor composed of different kinds of tissue, none of which normally occurs together or at the site of the tumor. Teratomas are most common in the ovaries or testes.
The pink-colored film or ring frequently seen on showers, tubs, toilets and pet water bowls is typically caused by growth of the airborne bacteria Serratia marcesens. This harmless nuisance organism reacts with standing water and frequently forms during spring and summer months.
Beets, blackberries, and rhubarb can temporarily turn urine pink or red, which can be alarming, because it may be mistaken for blood. The pigment that gives beets their deep magenta color is stable only at certain levels of stomach acidity and is usually too faint to show up in most people's urine.