Main Entry: tu·mor

Pronunciation: \ˈtü-mər, ˈtyü-\

Function: noun

Etymology: Middle English tumour, from Latin tumor, from tumēre

Date: 15th century

1 : a swollen or distended part
2 : an abnormal benign or malignant new growth of tissue that possesses no physiological function and arises from uncontrolled usually rapid cellular proliferation —called also neoplasm

— tu·mor·al \-mə-rəl\ adjective

— tu·mor·like \-mər-ˌlīk\ adjective