noun
neoplasm; tumor
Medical term for an abnormal growth of tissue; used in clinical contexts.
医師は新生物の有無を調べるために検査を行った。
The doctor performed tests to check for the presence of a neoplasm.
腫瘍 is a more common general term for tumor, while 新生物 is a formal medical term often used in pathology.
Compound of 新 (new) + 生物 (living thing, organism), literally 'new growth'. A modern medical coinage.