germinoma

noun
ger·​mi·​no·​ma | \ ˌjər-mə-ˈnō-mə How to pronounce germinoma (audio) \
plural germinomas

Medical Definition of germinoma

: a malignant tumor (as of the ovary, testis, mediastinum, or pineal gland) that originates from undifferentiated embryonic germ cells — see dysgerminoma, seminoma