sebum
UK[ˈsiːbəm]US[ˈsiːbəm]
n
an oily substance secreted by the sebaceous glands that lubricates the skin and hair.
Etymology
the word "sebum" is a direct borrowing from latin, where it meant "grease, tallow, suet." the latin term is believed to derive from the proto-indo-european root sai-/soi-, meaning "grease, oil," which also gave rise to related words in other indo-european languages. entering english in the late 19th century through scientific discourse, it was adopted specifically to name the oily secretion of the skin's glands, preserving its core semantic link to fat or grease. this specialized medical and biological usage narrowed its meaning from a general term for animal fat to a precise physiological substance.
Analysis
the word is a simplex loanword from latin, where it functioned as a noun meaning "grease, tallow."
Examples
excessive sebum production can lead to oily skin and acne.
the primary function of sebum is to keep the skin and hair moisturized.
a buildup of sebum and dead skin cells can clog pores.