seborrhea Syllabification: (seb·or·rhe·a)Pronunciation: /ˌsebəˈrēə/ (British seborrhoea)Definition of seborrhea noun Medicine excessive discharge of sebum from the sebaceous glands. Derivatives seborrheicPronunciation: /-ˈrē-ik/ adjective Origin: late 19th century: from sebum + -rrheaseborrhea in other Oxford dictionaries Definition of seborrhea in the British & World English dictionary