seb(o)-

Oil, fat, or grease.

Latin sebum, grease, tallow.

Sebum is the medical term for an oily secretion from the sebaceous glands in the skin; the latter word can also be an adjective referring more generally to oil or fat; seborrhoea (US seborrhea) (Greek rhoia, flow or flux) is excessive discharge of sebum from the sebaceous glands; sebacic acid is a white crystalline solid made from castor oil, used to produce candles, lubricants, and plasticizers.