Definitions of serum

1. watery fluid of the blood that resembles plasma but contains fibrinogen

2. A thin watery fluid, containing more or less albumin, secreted by the serous membranes of the body, such as the pericardium and peritoneum.

3. The watery portion of animal fluids, as blood, milk, etc.; the thin watery fluid filling certain cavities of the body.

4. The watery part of curdled milk: whey: the thin fluid which separates from the blood when it coagulates.

5. Whey; watery part of the blood.

6. A watery animal fluid, as the watery portion of the blood.

7. The thin transparent part of the blood; the thin part of milk; whey.

8. The thin watery substance like whey which separates from the blood when coagulated.

9. See under serous.