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neoplasm (n.)

"a new growth distinct from the tissue in which it occurs, a true tumor," 1864, coined in Modern Latin by German physiologist Karl Friedrich Burdach (1776-1847) from neo- "new" + Greek plasma "formation, anything formed" (see -plasm). Related: Neoplastic.

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Definitions of neoplasm from WordNet

neoplasm (n.)
an abnormal new mass of tissue that serves no purpose;
Synonyms: tumor / tumour
From wordnet.princeton.edu