A condition in which overactivity of the sebaceous glands causes the skin to become oily

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Seborrhea \Seb"or*rhe*a\, n. [NL., fr. L. sebum tallow + Gr. ? to flow.] (Med.) A morbidly increased discharge of sebaceous matter upon the skin; stearrhea.

Wiktionary Word definitions in Wiktionary
alt. (context disease English) A skin disorder causing scaly, flaky, itchy, red skin. n. (context disease English) A skin disorder causing scaly, flaky, itchy, red skin.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also seborrhoea , "discharge of sebaceous matter, especially as a scalp condition," 1849, coined in Modern Latin as a hybrid, from sebo- , used as comb. form of Latin sebum "tallow, suet, grease" (see sebum ) + Greek hroia "flow, flux," from rhein "to flow" ...

WordNet Word definitions in WordNet
n. a condition in which overactivity of the sebaceous glands causes the skin to become oily