blood serum

== English == === Alternative forms === bloodserum (dated) === Noun === blood serum (countable and uncountable, plural blood serums or blood sera) (biology, medicine) The portion of whole blood that is not blood cells and not clotting factors; it can be separated as a clear yellowish liquid after the blood has been allowed to clot. Synonym: serum (ellipsis) Holonyms: plasma, blood plasma < blood Comeronyms: blood cells, red blood cells, white blood cells, platelets; clotting factors