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serum

se·rum [ srəm ] (plural se·rums or se·ra [ srə ])


noun 
Definition:
 
1. liquid part of blood: the fluid that separates from clotted blood, similar to plasma but without clotting agents

2. body fluid: a clear watery body fluid, especially that exuded by serous membranes

3. medicine 
Same as  antiserum


[Late 17th century. < Latin, "whey, watery fluid"]

se·rum·al adjective
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