pediatrics Syllabification: (pe·di·at·rics)Pronunciation: /ˌpēdēˈatriks/ (Britishpaediatrics)Definition of pediatrics noun [treated as singular] the branch of medicine dealing with children and their diseases. Derivatives pediatricPronunciation: /-ˈatrik/ adjective Origin: late 19th century: from pedo-1 'of children' + Greek iatros 'physician' + -icspediatrics in other Oxford dictionaries Definition of pediatrics in the British & World English dictionary