Main Entry: tu·me·fac·tion

Pronunciation: \ˌtü-mə-ˈfak-shən, ˌtyü-\

Function: noun

Etymology: Middle English tumefaccioun, from Medieval Latin tumefaccion-, tumefaccio, from Latin tumefacere to cause to swell, from tumēre to swell + facere to make, do — more at thumb, do

Date: 15th century

1 : an action or process of swelling or becoming tumorous
2 : swelling