blue-blooded Definition
blue bloodnoun 1. Royal or aristocratic ancestry.
Derivative: blue-blooded
adj
Etymology: 19c: a translation of the Spanish
sangre azul, probably referring originally to the ‘blue blood' visible in the veins of the fair-skinned pure-blooded aristocratic old families of Castile (as distinct from those with darker skin, of Moorish blood or of mixed race, etc).