Serum

Blood serum — the pale yellowish fluid which exudes from the clot formed in the coagulation of the blood; the liquid portion of the blood, after removal of the blood corpuscles and the fibrin.

Muscle serum — the thin watery fluid which separates from the muscles after coagulation of the muscle plasma; the watery portion of the plasma. See Muscle plasma, under Plasma.

Serum albumin — an albuminous body, closely related to egg albumin, present in nearly all serous fluids; esp., the albumin of blood serum.

Serum globulin — paraglobulin.

Serum of milk — the whey, or fluid portion of milk, remaining after removal of the casein and fat.