a class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response
"The blood test revealed elevated levels of immunoglobulin, confirming that her body was actively producing antibodies to fight off the new infection."
Any of the glycoproteins in blood serum that respond to invasion by foreign antigens and that protect the host by removing pathogens; an antibody.
"The doctor explained that a specific immunoglobulin produced after the vaccination was essential for neutralizing the virus before it could infect his cells."