neurilemmoma
noun
neu·ri·lem·mo·ma
variants:
or neurilemoma
or neurolemmoma \ -lə-ˈmō-mə 
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plural neurilemmomas
also neurilemmomata\ -mət-ə
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Medical Definition of neurilemmoma
: a tumor of the myelinated sheaths of nerve fibers that consist of Schwann cells in a matrix
— called also neurinoma, schwannoma