UK and ANZ, [US and ANZ] tumor [noun] [C] - a mass of diseased cells which might become a lump or cause illnessShe has a malignant/benign tumour in her breast.They were shattered by the news that their child had been diagnosed as having an inoperable brain tumour.
TUMOUR
Meaning of TUMOUR in English
Cambridge English vocab. Кембриджский английский словарь. 2012