Pertaining to tallow or fat; made of, containing, or secreting fatty matter; fatty.In botany, having the appearance of tallow, grease, or fat: as, the sebaceous secretions of some plants.In anatomy and zoology:Fatty; oily; greasy; unctuous: as, sebaceous substances: specifically noting the secretion of the sebaceous follicles.Secreting, containing, or conveying sebaceous matter: as, a sebaceous follicle, gland, or duct.Same as pearl-tumor, 2.