SEBACEOUS Meaning of SEBACEOUS in English [ sɪ'beɪʃəs ]■ adjective technical relating to oil or fat. ↘relating to a ~ gland or its secretion.OriginC18: from L. sebaceus (from sebum 'tallow') + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004