macroglobulin
noun
mac·ro·glob·u·lin ˌma-krō-ˈglä-byə-lən 
: a highly polymerized globulin (such as IgM) of high molecular weight
Word History
Etymology
borrowed from German Makroglobulin, from makro- macro- + Globulin globulin
First Known Use
1952, in the meaning defined above
Medical Definition
macroglobulin
noun
mac·ro·glob·u·lin ˌmak-rō-ˈgläb-yə-lən
: a highly polymerized globulin (as IgM) of high molecular weight