adjective Download 🔗Share Containing, 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.) Examples : "The doctor examined the blister and noted the serous fluid inside, reassuring the patient that it was just a normal reaction and not infected. " medicine physiology body substance anatomy biochemistry science Chat with AIVocabulary GamePractice Reading