Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

seborrhea
     n : a condition in which overactivity of the sebaceous glands
         causes the skin to become oily