germinoma
noun
ger·mi·no·ma
| \ ˌjər-mə-ˈnō-mə
\
\
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