A cancerous neoplasm, or abnormal growth, of the ovary which is thought to arise from primordial germ line cells while the individual is still an embryo and the ovary has not yet been sexually differentiated from the generic gonad. This type of cancer is also called an ovarian seminoma

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.