a tumor containing various kinds of embryonic tissue, as of hair and teeth
Origin of teratomaterat(o)- + -oma
nounpl. ter·a·to·mas or ter·a·to·ma·ta
A tumor consisting of different types of tissue, as of skin, hair, and muscle, caused by the development of independent germ cells.
(plural teratomas or teratomata)
From terato- +"Ž -oma