sebum

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sebum:

see sebaceous glandsebaceous gland
, gland in the skin of mammals that secretes an oily substance called sebum. In humans, sebaceous glands are primarily found in association with hair follicles but also occur in hairless areas of the skin, except for the palms of the hand and soles of the feet.
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sebum

[′sē·bəm]
(physiology)
The secretion of sebaceous glands, composed of fat, cellular debris, and keratin.

sebum

the oily secretion of the sebaceous glands that acts as a lubricant for the hair and skin and provides some protection against bacteria