n. A thick oily substance, secreted by the sebaceous glands of the skin, that consists of fat, keratin and cellular debris.
The Century Dictionary and Cyclopedia
n. The secretion of the sebaceous glands. Also sebum cutaneum.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the oily secretion of the sebaceous glands; with perspiration it moistens and protects the skin
Word Usage
"Besides sprouting up hairs that sense things, your skin lubricates itself with oils we call sebum produced by sebaceous glands and also absorbs certain medications and hormones."