Scrabble Dictionary

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Yes, serum is playable

...and is worth 9 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Serum" Definition

noun

Blood serum from the tissues of immunized animals, containing antibodies and used to transfer immunity to another individual.
The clear yellowish fluid obtained upon separating whole blood into its solid and liquid components after it has been allowed to clot. Also called blood serum.
Watery fluid from animal tissue, such as that found in edema.
the watery portion of an animal fluid remaining after coagulation.

adjective

Occurring or found in the blood serum .

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