blue blood(redirected from a blue blood)
A member of a wealthy, upper-class family or ancestry. That senator is a blue blood, so of course he doesn't understand the common man's concerns.
1. Fig. the blood [heredity] of a noble family; aristocratic ancestry. The earl refuses to allow anyone who is not of blue blood to marry his son. Although Mary's family is poor, she has blue blood in her veins.
2. Fig. a person of aristocratic or wealthy ancestry. Because his great-grandparents made millions, he is regarded as one of the city's blue bloods.
Of high or noble birth. The term is a translation of the Spanish sangre azul, which was applied to Spain’s pure-blooded aristocrats, meaning those whose ancestors had not intermarried with the Moors. Consequently they were fairly light-skinned and their veins showed bluer through the skin than those in Spaniards of mixed blood. The expression was used in England from the early nineteenth century, and was, like so many, satirized by W. S. Gilbert (Iolanthe, 1882, where Lord Tolloller is complaining that the fair maid Phyllis is not impressed by his title): “Blue blood! blue blood! When virtuous love is sought thy power is naught, though dating from the Flood, blue blood!”