adjective🔗ShareContaining, secreting, or resembling serum; watery; a fluid or discharge that is pale yellow and transparent, usually representing something of a benign nature. (This contrasts with the term sanguine, which means blood-tinged and usually harmful.)"The doctor examined the blister and noted the serous fluid inside, reassuring the patient that it was just a normal reaction and not infected. "medicinephysiologybodysubstanceanatomybiochemistryscienceChat with AIVocabulary GamePractice Reading