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.
Pink Stains â What Is It? Pink residue is generally not a problem with water quality. A pink discoloration may be a result of iron found in some well water or old pipes in the delivery system but would not be isolated to only one toilet, one fixture or one room.