A neoplasm of the germinal tissue of gonads, mediastinum, or pineal region such as seminoma. [L. germen, bud, + -oma, tumor]
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ger·mi·no·ma .jər-mə-'nō-mə n, pl -mas a malignant tumor (as of the ovary, testis, mediastinum, or pineal gland) that originates from undifferentiated embryonic germ cells see dysgerminoma, seminoma
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ger·mi·no·ma (jur″mĭ-noґmə) a type of germ cell tumor consisting of large round cells with vesicular nuclei, usually found in the ovary, undescended testis, anterior mediastinum, or pineal gland; in males these are called seminomas and in females dysgerminomas.Medical dictionary. 2011.