Know how to use "fewer" and "less"? Find out.
teratoma ter·a·to·ma (těr'ə-tō'mə)
n. pl. ter·a·to·mas or ter·a·to·ma·ta (-mə-tə)
A tumor consisting of different types of tissue, as of skin, hair, and muscle, caused by the development of independent germ cells. Also called teratoblastoma, teratoid tumor.