/ˈsɪrəm/
serum
BrE /ˈsɪərəm/
NAmE /ˈsɪrəm/
(
plural
sera
BrE /ˈsɪərə/
NAmE /ˈsɪrə/
or
set·ums)
[U] (biology)
the thin liquid that remains from blood when the rest has clotted
[U, C] (medical)
serum taken from the blood of an animal and given to people to protect them from disease, poison, etc.
snakebite serum
[U]
any liquid like water in body tissue