ˌstrepˈtavədə̇n, -təˈvīd ə n noun
Etymology: New Latin strept- (from Streptomyces ) + English avidin
: a protein similar to avidin that is produced by a bacterium of the genus Streptomyces ( S. avidinii ), has four identical subunits that each bind tightly to a molecule of biotin, and is used especially in the detection of molecules (as nucleic acids or antibodies) linked to a biotin label