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1728, "secreting sebum," from Latin sebaceus "of tallow," from sebum "tallow, grease" (see sebum). Meaning "oily, greasy, fatty" is from 1783.
sebaceous se·ba·ceous (sĭ-bā'shəs)adj.
Of, resembling, or characterized by fat or sebum; fatty.
Secreting or producing fat or sebum.