swelling Syllabification: (swell·ing)Pronunciation: /ˈsweliNG/Translate swelling | into French | into German | into Italian | into Spanish Definition of swelling noun an abnormal enlargement of a part of the body, typically as a result of an accumulation of fluid. a natural rounded protuberance:the lobes are prominent swellings on the base of the brainswelling in other Oxford dictionaries Definition of swelling in the British & World English dictionary