sebum

[see-buhm]
noun Physiology.
the fatty secretion of the sebaceous glands.

Origin:
1700–10; < Latin sēbum tallow, grease

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Collins
World English Dictionary
sebum (ˈsiːbəm)
 
n
the oily secretion of the sebaceous glands that acts as a lubricant for the hair and skin and provides some protection against bacteria
 
[C19: from New Latin, from Latin: tallow]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sebum se·bum (sē'bəm)
n.
The semifluid secretion of the sebaceous glands, consisting chiefly of fat, keratin, and cellular material.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sebum   (sē'bəm)  Pronunciation Key 
The fatty substance secreted by the sebaceous glands of mammals that protects and lubricates the skin and hair.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for sebum
When the skin produces excessive sebum, it becomes heavy and thick in texture.
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