- (n.) A thin watery fluid, containing more or less albumin, secreted by the serous membranes of the body, such as the pericardium and peritoneum.
- (n.) The watery portion of certain animal fluids, as blood, milk, etc.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). serum. Retrieved September 21, 2026, from http://smartdefine.org/serum/definitions/2060766 |
| Chicago | Webster's. 2011. "serum" http://smartdefine.org/serum/definitions/2060766 (accessed September 21, 2026). |
| Harvard | Webster's 2011, serum, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/serum/definitions/2060766>. |
| MLA | Webster's. "serum" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/serum/definitions/2060766> |