a protein present in blood serum and active in the destruction of bacteria and the neutralization of viruses
Origin:
< pro(tein) + L perdere, to destroy + -in
See properdin in American Heritage Dictionary 4
noun
A protein in blood serum that participates in the body's immune response by working in conjunction with the alternative pathway of the complement system.
Origin:
Origin: Probably pro-1
Origin: + Latin perdere, to destroy; see perdition