Learn how to say Tumours correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word tumor:
a swelling on some part of the body
a mass of new tissue growth independent of its surrounding structures, having no physiological function; neoplasm: such tumors are classified as benign or malignant
(obsolete) high-flown language; bombast
(Brit. sp. , British): ˈtumour