noun, plural blastomas, blastomata [bla-stoh-muh-tuh] . Pathology.
a tumor originating from undifferentiated embryonic cells and having little or no connective tissue.

blast- + -oma Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blastoma (ˌblæsˈtəʊmə)
n , pl -mata, -mas
 a.  a tumour composed of embryonic tissue that has not yet developed a specialized function
 b.  (in combination): neuroblastoma
[C20: New Latin, from blasto- + -oma]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

blastoma blas·to·ma (blā-stō'mə)
n. pl. blas·to·mas or blas·to·ma·ta (-mə-tə)
A neoplasm composed of immature, undifferentiated cells. Also called blastocytoma, embryonal carcinosarcoma.

The American Heritage® Stedman's Medical Dictionary
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