noun 다운로드 🔗공유 피지 A thick oily substance, secreted by the sebaceous glands of the skin, that consists of fat, keratin and cellular debris. Examples : "The teenager's skin was oily because of excess sebum. " 과도한 피지 때문에 그 십대의 피부는 기름졌다. body physiology substance anatomy biology medicine chemistry AI와 채팅어휘 게임독해 연습