Etymology
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sebum (n.)

secretion of the sebaceous glands, 1728, from medical use of Latin sebum "sebum, suet, grease," probably related to sapo "soap" (see soap (n.)).

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Definitions of sebum

sebum (n.)
the oily secretion of the sebaceous glands; with perspiration it moistens and protects the skin;
From wordnet.princeton.edu